diff --git a/routes/api_routes.py b/routes/api_routes.py
index 86e04fe..cf34bd5 100644
--- a/routes/api_routes.py
+++ b/routes/api_routes.py
@@ -9,8 +9,10 @@ import os
 import threading
 import importlib
 from datetime import datetime, timezone, timedelta
+import re
 from flask import Blueprint, request, jsonify
 from sqlalchemy import func, desc, text
+from urllib.parse import parse_qs, urlparse
 
 from auth import login_required
 from config import BASE_DIR
@@ -18,6 +20,8 @@ from database.manager import DatabaseManager
 from database.models import Product, PriceRecord
 from database.edm_models import PromoProduct
 from services.logger_manager import SystemLogger
+from utils.momo_url_utils import build_momo_product_url, normalize_momo_product_url
+from utils.momo_url_utils import is_probable_momo_icode
 
 # 時區設定
 TAIPEI_TZ = timezone(timedelta(hours=8))
@@ -420,6 +424,9 @@ def get_price_change_details():
     db = DatabaseManager()
     session = db.get_session()
     try:
+        def _safe_product_url(product):
+            return normalize_momo_product_url(product.url, product.i_code) or build_momo_product_url(product.i_code)
+
         # 取得今日起始時間
         now_taipei = datetime.now(TAIPEI_TZ)
         today_start = now_taipei.replace(hour=0, minute=0, second=0, microsecond=0, tzinfo=None)
@@ -467,7 +474,7 @@ def get_price_change_details():
                         'product_id': product.i_code,
                         'name': product.name,
                         'category': product.category,
-                        'url': product.url,
+                        'url': _safe_product_url(product),
                         'image_url': product.image_url or '/static/placeholder.png',
                         'old_price': old_price,
                         'current_price': record.price,
@@ -484,7 +491,7 @@ def get_price_change_details():
                         'product_id': product.i_code,
                         'name': product.name,
                         'category': product.category,
-                        'url': product.url,
+                        'url': _safe_product_url(product),
                         'image_url': product.image_url or '/static/placeholder.png',
                         'old_price': old_price,
                         'current_price': record.price,
@@ -509,7 +516,7 @@ def get_price_change_details():
                         'product_id': product.i_code,
                         'name': product.name,
                         'category': product.category,
-                        'url': product.url,
+                        'url': _safe_product_url(product),
                         'image_url': product.image_url or '/static/placeholder.png',
                         'last_price': last_record.price,
                         'update_time': product.updated_at.strftime('%Y-%m-%d %H:%M') if product.updated_at else ''
@@ -522,3 +529,62 @@ def get_price_change_details():
         return jsonify({'products': []}), 500
     finally:
         session.close()
+
+
+@api_bp.route('/api/track_momo_link', methods=['POST'])
+@login_required
+def track_momo_link():
+    """API: 記錄 MOMO 連結點擊與異常開啟事件，用於診斷自動開啟來源。"""
+    def _is_blocked_momo_url(url: str) -> bool:
+        url_l = str(url or '').lower()
+        if 'ec404.html' in url_l or 'ec404' in url_l:
+            return True
+
+        try:
+            parsed = urlparse(str(url or ''))
+            path = (parsed.path or '').lower()
+            if 'goodsdetail' in path:
+                query = parse_qs(parsed.query or '')
+                i_code = (query.get('i_code') or [''])[0]
+                if i_code:
+                    return not is_probable_momo_icode(i_code)
+                if not re.search(r'/goodsdetail/[^/]+', path):
+                    return True
+        except Exception:
+            pass
+
+        return False
+
+    payload = request.get_json(silent=True) or {}
+    url = str(payload.get('url') or '').strip()
+    effective_url = str(payload.get('effective_url') or '').strip()
+    if not url:
+        return jsonify({'status': 'ignored', 'reason': 'missing_url'}), 400
+
+    is_blocked = _is_blocked_momo_url(url) or _is_blocked_momo_url(effective_url)
+    level = "[Web] [MOMO_LINK_TRACK] "
+    product_id = str(payload.get('product_id', '') or '').strip()
+    i_code = str(payload.get('i_code', '') or '').strip()
+    source = str(payload.get('source', '') or 'unknown').strip()
+    page = str(payload.get('page', '') or '').strip()
+    label = str(payload.get('label', '') or '').strip()
+    platform = str(payload.get('platform', '') or 'momo').strip()
+    product_name = str(payload.get('product_name', '') or '').strip()
+    referer = request.headers.get('Referer', '')
+    user_ip = request.remote_addr
+
+    if not effective_url:
+        effective_url = url
+
+    msg = (
+        f"{level}platform={platform} source={source} page={page} "
+        f"i_code={i_code} product_id={product_id} label={label} "
+        f"name={product_name} url={url} effective_url={effective_url} ip={user_ip} referer={referer}"
+    )
+
+    if is_blocked:
+        sys_log.warning(msg + " | status=blocked_link")
+    else:
+        sys_log.info(msg + " | status=tracked")
+
+    return jsonify({'status': 'ok'})
diff --git a/routes/dashboard_routes.py b/routes/dashboard_routes.py
index 5107f2c..c9b9a9e 100644
--- a/routes/dashboard_routes.py
+++ b/routes/dashboard_routes.py
@@ -27,6 +27,7 @@ from services.cache_manager import (
     _DASHBOARD_SHARED_CACHE_FILE,
     _DASHBOARD_STALE_CACHE_FILE,
 )
+from utils.momo_url_utils import build_momo_product_url, normalize_momo_product_url
 
 # 時區設定
 TAIPEI_TZ = timezone(timedelta(hours=8))
@@ -47,9 +48,7 @@ def _build_pchome_product_url(product_id):
 
 
 def _build_momo_product_url(i_code):
-    if not i_code:
-        return None
-    return f"https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code={str(i_code).strip()}"
+    return build_momo_product_url(i_code)
 
 
 def _to_float(value):
@@ -189,6 +188,7 @@ def _ai_pick_evidence_fields(model_footprint):
 def _dashboard_decision_row(row, tone):
     sku = str(row.get('sku') or '')
     pchome_id = row.get('competitor_product_id')
+    momo_url = normalize_momo_product_url(row.get('momo_url'), sku) or _build_momo_product_url(sku)
     return {
         'sku': sku,
         'name': row.get('name') or '',
@@ -200,7 +200,7 @@ def _dashboard_decision_row(row, tone):
         'confidence': _to_float(row.get('confidence')),
         'reason': row.get('reason') or '',
         'tone': tone,
-        'momo_url': row.get('momo_url') or _build_momo_product_url(sku),
+        'momo_url': momo_url,
         'pchome_id': pchome_id,
         'pchome_name': row.get('competitor_product_name') or '',
         'pchome_url': _build_pchome_product_url(pchome_id),
@@ -246,11 +246,12 @@ def _load_competitor_decision_overview(session, latest_items=None):
                 sku = str(getattr(product, 'i_code', '') or '')
                 if not sku:
                     continue
+                safe_product_url = normalize_momo_product_url(getattr(product, 'url', None), sku)
                 item_map[sku] = {
                     'sku': sku,
                     'name': getattr(product, 'name', '') or '',
                     'category': getattr(product, 'category', '') or '',
-                    'momo_url': getattr(product, 'url', None) or _build_momo_product_url(sku),
+                    'momo_url': safe_product_url or _build_momo_product_url(sku),
                     'momo_price': _to_float(getattr(record, 'price', None)) or 0,
                 }
 
@@ -350,7 +351,7 @@ def _load_competitor_decision_overview(session, latest_items=None):
                     'name': row['name'],
                     'category': row['category'],
                     'momo_price': row['momo_price'],
-                    'momo_url': row['momo_url'],
+                    'momo_url': normalize_momo_product_url(row.get('momo_url'), row.get('sku')) or _build_momo_product_url(row.get('sku')),
                 }
                 for row in sorted(pending_items, key=lambda row: row['momo_price'], reverse=True)[:3]
             ]
@@ -541,7 +542,7 @@ def _load_competitor_decision_overview(session, latest_items=None):
                 'name': row.get('name') or '',
                 'category': row.get('category') or '',
                 'momo_price': _to_float(row.get('momo_price')) or 0,
-                'momo_url': row.get('momo_url') or _build_momo_product_url(row.get('sku')),
+                'momo_url': normalize_momo_product_url(row.get('momo_url'), row.get('sku')) or _build_momo_product_url(row.get('sku')),
             }
             for row in session.execute(pending_sql).mappings().all()
         ]
@@ -956,6 +957,8 @@ def get_consolidated_data():
         unique_items = []
         for r in latest_records:
             pid = r.product_id
+            product = r.product
+            safe_product_url = normalize_momo_product_url(getattr(product, 'url', None), getattr(product, 'i_code', ''))
 
             price_7d = prices_7d_ago_map.get(pid)
             price_30d = prices_30d_ago_map.get(pid)
@@ -991,6 +994,7 @@ def get_consolidated_data():
 
             unique_items.append({
                 'record': r,
+                'safe_product_url': safe_product_url or _build_momo_product_url(getattr(product, 'i_code', '')),
                 'stats': {'7d_diff': stats_7d_diff, '30d_diff': stats_30d_diff, '1d_diff': today_diff},
                 'yesterday_diff': yesterday_diff,
                 'today_changes': today_changes,
@@ -1384,6 +1388,11 @@ def index():
             item['safe_created_at'] = getattr(item['record'].product, 'created_at', None)
             sku = str(item['record'].product.i_code)
             item['ai_pick'] = ai_pick_map.get(sku)
+            item['safe_momo_url'] = (
+                item.get('safe_product_url')
+                or normalize_momo_product_url(item['record'].product.url, sku)
+                or _build_momo_product_url(sku)
+            )
 
         # 為當前頁面項目添加顏色
         for item in paged_items:
diff --git a/routes/edm_routes.py b/routes/edm_routes.py
index b6d903e..fb1240c 100644
--- a/routes/edm_routes.py
+++ b/routes/edm_routes.py
@@ -16,6 +16,7 @@ from database.manager import DatabaseManager
 from database.models import Product
 from database.edm_models import PromoProduct
 from services.logger_manager import SystemLogger
+from utils.momo_url_utils import build_momo_product_url, normalize_momo_product_url
 
 # 時區設定
 TAIPEI_TZ = timezone(timedelta(hours=8))
@@ -217,6 +218,7 @@ def _build_promo_dashboard_data(session, page_type, page_name, sort_by, order):
 
     # 8. 附加分類資訊到每個 item
     for item in items_in_batch:
+        item.safe_product_url = normalize_momo_product_url(item.url, item.i_code) or build_momo_product_url(item.i_code)
         item.main_category = product_categories.get(item.i_code)
         if item.main_category:
             item.category_color = get_color_for_string(item.main_category)
diff --git a/routes/export_routes.py b/routes/export_routes.py
index 78d5195..8e70467 100644
--- a/routes/export_routes.py
+++ b/routes/export_routes.py
@@ -20,6 +20,7 @@ from database.manager import DatabaseManager
 from database.models import Product, PriceRecord
 from services.exporter import Exporter
 from services.logger_manager import SystemLogger
+from utils.momo_url_utils import build_momo_product_url, normalize_momo_product_url
 
 # 時區設定
 TAIPEI_TZ = timezone(timedelta(hours=8))
@@ -178,8 +179,9 @@ def export_excel_ai_picks():
         export_rows = []
         for row in rows:
             sku = str(row.get('sku') or '')
+            normalized_sku = str(sku or '').strip()
             pchome_id = row.get('competitor_product_id') or ''
-            momo_url = row.get('momo_url') or f"https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code={sku}"
+            momo_url = normalize_momo_product_url(row.get('momo_url'), normalized_sku) or build_momo_product_url(normalized_sku)
             pchome_url = f"https://24h.pchome.com.tw/prod/{str(pchome_id).strip()}" if pchome_id else ''
             footprint = row.get('model_footprint') or {}
             if isinstance(footprint, str):
@@ -392,6 +394,7 @@ def export_price_changes():
         for product, record, old_price in products:
             change = record.price - old_price
             change_pct = (change / old_price * 100) if old_price > 0 else 0
+            safe_product_url = normalize_momo_product_url(product.url, product.i_code) or build_momo_product_url(product.i_code)
             ws.append([
                 product.i_code,
                 product.name,
@@ -401,7 +404,7 @@ def export_price_changes():
                 change,
                 f"{change_pct:.2f}%",
                 record.timestamp.strftime('%Y-%m-%d %H:%M'),
-                product.url
+                safe_product_url
             ])
 
         # 調整欄寬
diff --git a/routes/price_comparison_routes.py b/routes/price_comparison_routes.py
index c6b981f..8a61186 100644
--- a/routes/price_comparison_routes.py
+++ b/routes/price_comparison_routes.py
@@ -6,6 +6,7 @@ from flask import Blueprint, request, jsonify, render_template
 import logging
 
 from auth import login_required
+from utils.momo_url_utils import extract_momo_i_code, is_probable_momo_icode
 from services.price_comparison import (
     compare_brand_prices,
     BRAND_ALIASES,
@@ -200,11 +201,26 @@ def parse_momo_excel():
         products = []
         for idx, row in df.iterrows():
             try:
+                raw_id = ''
+                if id_col:
+                    raw_id = str(row[id_col]).strip()
+                    if raw_id in {'nan', 'None', 'NoneType', 'nan.'}:
+                        raw_id = ''
+                raw_url = ''
+                if url_col:
+                    raw_url = str(row[url_col]).strip()
+                    if raw_url in {'nan', 'None', 'NoneType'}:
+                        raw_url = ''
+
+                product_id = raw_id if is_probable_momo_icode(raw_id) else extract_momo_i_code(raw_url) or ''
+                if not is_probable_momo_icode(product_id):
+                    product_id = ''
+
                 product = {
                     'name': str(row[name_col]),
                     'price': int(float(row[price_col])),
-                    'product_id': str(row[id_col]) if id_col else f'momo_{idx}',
-                    'url': str(row[url_col]) if url_col else ''
+                    'product_id': product_id,
+                    'url': raw_url
                 }
                 products.append(product)
             except (ValueError, TypeError):
@@ -263,17 +279,22 @@ def quick_compare():
             }), 400
 
         # 補充缺失欄位
-        for i, p in enumerate(pchome_products):
-            if 'product_id' not in p:
-                p['product_id'] = f'pchome_{i}'
-            if 'product_url' not in p:
-                p['product_url'] = ''
+        def _normalize_product_id(products_list, source_prefix, id_field, url_field):
+            for i, p in enumerate(products_list):
+                if id_field not in p:
+                    p[id_field] = ''
+                product_id = str(p.get(id_field) or '').strip()
+                if not is_probable_momo_icode(product_id):
+                    product_id = extract_momo_i_code(p.get(url_field)) or ''
+                if not is_probable_momo_icode(product_id):
+                    p[id_field] = f'{source_prefix}_{i}'
+                else:
+                    p[id_field] = product_id
+                if url_field not in p or p.get(url_field) is None:
+                    p[url_field] = ''
 
-        for i, p in enumerate(momo_products):
-            if 'product_id' not in p:
-                p['product_id'] = f'momo_{i}'
-            if 'url' not in p:
-                p['url'] = ''
+        _normalize_product_id(pchome_products, 'pchome', 'product_id', 'product_url')
+        _normalize_product_id(momo_products, 'momo', 'product_id', 'url')
 
         # 執行比價 (不限定品牌)
         result = compare_brand_prices('', pchome_products, momo_products)
diff --git a/scheduler.py b/scheduler.py
index 5d610ea..a45179e 100644
--- a/scheduler.py
+++ b/scheduler.py
@@ -20,6 +20,7 @@ from database.models import Product, PriceRecord
 from database.edm_models import PromoProduct
 from services.notification_manager import NotificationManager
 from services.edm_notifier import EdmNotifier # V-New: 導入新的通知模組
+from utils.momo_url_utils import normalize_momo_product_url
 
 # V-Fix: 改為匯入讀取函式，而非靜態變數，以支援動態更新
 from config import load_momo_categories
@@ -310,7 +311,7 @@ def run_momo_task():
                             if not link_els: continue
                             link_url = link_els[0].get_attribute("href")
 
-                            if not link_url or "javascript" in link_url:
+                            if not link_url:
                                 continue
 
                             # 從 URL 提取 i_code
@@ -331,6 +332,13 @@ def run_momo_task():
                             except ValueError:
                                 i_code = i_code_raw.upper()
 
+                            product_url = normalize_momo_product_url(link_url, i_code)
+                            if not product_url:
+                                logging.warning(
+                                    f"[Crawler] [MOMO]   ⚠️ 商品網址無法修正，改用 i_code 組網址 | i_code: {i_code}"
+                                )
+                                continue
+
                             # 提取名稱
                             name_els = container.find_elements(By.CSS_SELECTOR, ".prdName, .goodsName, .productName, .title")
                             if name_els:
@@ -369,7 +377,7 @@ def run_momo_task():
                                 'i_code': str(i_code),
                                 'name': title,
                                 'category': cat_name,
-                                'url': link_url,
+                                'url': product_url,
                                 'image_url': image_url,
                                 'price': price_val
                             })
@@ -396,6 +404,9 @@ def run_momo_task():
                             else:
                                 if product.category != item['category']:
                                     product.category = item['category']
+                                normalized_existing_url = normalize_momo_product_url(item['url'], item['i_code'])
+                                if product.url != normalized_existing_url:
+                                    product.url = normalized_existing_url
                                 if item['image_url']:
                                     product.image_url = item['image_url']
 
@@ -724,13 +735,20 @@ def run_edm_task(lpn_code="O1K5FBOqsvN"):
                                     previous_price = prev_record.previous_price
 
                         is_changed = status_change != "NONE"
+                        normalized_link_url = normalize_momo_product_url(link_url, i_code)
+                        if not normalized_link_url:
+                            logging.warning(
+                                f"[Crawler] [EDM]         ⚠️ 商品網址無法修正，改用 i_code 組網址 | i_code: {i_code}"
+                            )
+                            continue
+
                         new_promo = PromoProduct(
                             batch_id=batch_id,
                             i_code=i_code,
                             name=name,
                             price=price,
                             discount_text=discount_text,
-                            url=link_url,
+                            url=normalized_link_url,
                             previous_price=previous_price, # V9.64: 寫入舊價格
                             time_slot=time_slot,
                             status_change=status_change if is_changed else "ACTIVE",
@@ -1162,8 +1180,15 @@ def run_festival_task(lpn_code="O7ylWfihYUM"):
                                 logging.info(f"[Crawler] [Festival]         -> 狀態: 圖片更新 (UPDATE)")
 
                         is_changed = status_change != "NONE"
+                        normalized_link_url = normalize_momo_product_url(link_url, i_code)
+                        if not normalized_link_url:
+                            logging.warning(
+                                f"[Crawler] [Festival]         ⚠️ 商品網址無法修正，改用 i_code 組網址 | i_code: {i_code}"
+                            )
+                            continue
+
                         new_promo = PromoProduct(
-                            batch_id=batch_id, i_code=i_code, name=name, price=price, url=link_url,
+                            batch_id=batch_id, i_code=i_code, name=name, price=price, url=normalized_link_url,
                             image_url=image_url, previous_price=previous_price, time_slot=group_title,
                             status_change=status_change if is_changed else "ACTIVE", crawled_at=now, activity_time_text=activity_name,
                             session_time_text=group_title, page_type=PAGE_TYPE
@@ -1497,8 +1522,15 @@ def run_promo_event_task(lpn_code, page_type, activity_name):
                                 logging.info(f"[Crawler] [{page_type.upper()}]         -> 狀態: 圖片更新 (UPDATE)")
 
                         is_changed = status_change != "NONE"
+                        normalized_link_url = normalize_momo_product_url(link_url, i_code)
+                        if not normalized_link_url:
+                            logging.warning(
+                                f"[Crawler] [{page_type.upper()}]         ⚠️ 商品網址無法修正，改用 i_code 組網址 | i_code: {i_code}"
+                            )
+                            continue
+
                         new_promo = PromoProduct(
-                            batch_id=batch_id, i_code=i_code, name=name, price=price, url=link_url,
+                            batch_id=batch_id, i_code=i_code, name=name, price=price, url=normalized_link_url,
                             image_url=image_url, previous_price=previous_price, time_slot=group_title,
                             status_change=status_change if is_changed else "ACTIVE", crawled_at=now, activity_time_text=activity_name,
                             session_time_text=group_title, page_type=page_type
diff --git a/scripts/tools/sanitize_momo_urls.py b/scripts/tools/sanitize_momo_urls.py
new file mode 100644
index 0000000..5027ac9
--- /dev/null
+++ b/scripts/tools/sanitize_momo_urls.py
@@ -0,0 +1,119 @@
+#!/usr/bin/env python3
+"""
+修正 MOMO 商品與促銷商品網址中的壞連結（如 javascript:void(0)、EC404、非商品頁）
+將可修正者改為:
+1) 以 i_code 組出正確商品網址
+2) 無法修正時清空網址 (避免連到錯頁)
+"""
+import argparse
+import logging
+import os
+import sys
+
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+sys.path.insert(0, BASE_DIR)
+
+from database.manager import DatabaseManager
+from database.models import Product
+from database.edm_models import PromoProduct
+from utils.momo_url_utils import normalize_momo_product_url
+
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(message)s",
+)
+logger = logging.getLogger(__name__)
+
+
+def _sanitize_records(records, label, commit=False):
+    updated = 0
+    skipped = 0
+    cleared = 0
+    unchanged = 0
+
+    for record in records:
+        old_url = getattr(record, "url", None)
+        if not old_url:
+            unchanged += 1
+            continue
+
+        normalized = normalize_momo_product_url(old_url, getattr(record, "i_code", None))
+        if normalized == old_url:
+            unchanged += 1
+            continue
+
+        if normalized is None:
+            if commit:
+                record.url = None
+            cleared += 1
+            logger.info(
+                "清空 %s 不可修正 URL | id=%s | i_code=%s | old=%s",
+                label,
+                getattr(record, "id", "n/a"),
+                getattr(record, "i_code", ""),
+                old_url,
+            )
+        else:
+            if commit:
+                record.url = normalized
+            updated += 1
+            logger.info(
+                "修正 %s URL | id=%s | i_code=%s | old=%s | new=%s",
+                label,
+                getattr(record, "id", "n/a"),
+                getattr(record, "i_code", ""),
+                old_url,
+                normalized,
+            )
+
+    logger.info(
+        "%s 結果 | unchanged=%s, updated=%s, cleared=%s",
+        label,
+        unchanged,
+        updated,
+        cleared,
+    )
+    return {"unchanged": unchanged, "updated": updated, "cleared": cleared}
+
+
+def main(commit=False):
+    db = DatabaseManager()
+    session = db.get_session()
+    try:
+        product_rows = session.query(Product).all()
+        promo_rows = session.query(PromoProduct).all()
+
+        product_result = _sanitize_records(product_rows, "products", commit=commit)
+        promo_result = _sanitize_records(promo_rows, "promo_products", commit=commit)
+
+        if commit:
+            session.commit()
+            logger.info("變更已提交")
+        else:
+            session.rollback()
+            logger.info("Dry-run 模式：未提交變更")
+
+        logger.info(
+            "整體結果 | products: %s | promo_products: %s",
+            product_result,
+            promo_result,
+        )
+    except Exception as exc:
+        if commit:
+            session.rollback()
+        logger.exception("清理網址失敗: %s", exc)
+        raise
+    finally:
+        session.close()
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--commit",
+        action="store_true",
+        help="實際寫回資料庫（不加此參數則為 dry-run）",
+    )
+    args = parser.parse_args()
+    main(commit=args.commit)
diff --git a/services/price_comparison.py b/services/price_comparison.py
index 53d3a21..00f1a72 100644
--- a/services/price_comparison.py
+++ b/services/price_comparison.py
@@ -14,6 +14,7 @@ from typing import List, Dict, Optional, Tuple
 from dataclasses import dataclass, asdict
 from difflib import SequenceMatcher
 from datetime import datetime
+from utils.momo_url_utils import build_momo_product_url, normalize_momo_product_url
 
 logger = logging.getLogger(__name__)
 
@@ -182,6 +183,13 @@ class ProductNameParser:
         # 提取產品線和關鍵字
         product_line, keywords = self._extract_keywords(cleaned_name, brand)
 
+        safe_product_url = (
+            normalize_momo_product_url(product_url, product_id)
+            if source == 'momo'
+            else product_url
+        )
+        safe_product_url = safe_product_url or build_momo_product_url(product_id)
+
         return ParsedProduct(
             original_name=name,
             brand=brand,
@@ -192,7 +200,7 @@ class ProductNameParser:
             source=source,
             price=price,
             product_id=product_id,
-            product_url=product_url
+            product_url=safe_product_url
         )
 
     def _clean_name(self, name: str) -> str:
diff --git a/templates/base.html b/templates/base.html
index b909b1f..6ad9a63 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -157,6 +157,226 @@
     <!-- Bootstrap JS -->
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
 
+    <!-- MOMO 404 防呆攔截：避免自動打開 EC404 頁面 -->
+    <script>
+        (function () {
+            if (window.__momoLinkGuardInstalled) {
+                return;
+            }
+            window.__momoLinkGuardInstalled = true;
+
+            const MOMO_HOSTS = new Set(['www.momoshop.com.tw', 'm.momoshop.com.tw']);
+            const MOMO_CODE_RE = /^[A-Za-z0-9_-]{4,}$/;
+
+            const toText = value => (value == null ? '' : String(value));
+
+            const hasMomoHost = function (url) {
+                const target = toText(url).trim();
+                if (!target) {
+                    return false;
+                }
+                try {
+                    const parsed = new URL(target, location.origin);
+                    return MOMO_HOSTS.has((parsed.hostname || '').toLowerCase());
+                } catch (error) {
+                    return /(^|\/)m(?:\.momoshop\.com\.tw|\.momoshop\.com\.tw)(\/|$)|www\.momoshop\.com\.tw/i.test(target);
+                }
+            };
+
+            const isBlockedMomoUrl = function (url) {
+                const lowered = toText(url).toLowerCase();
+                if (lowered.includes('ec404.html') || lowered.includes('/ecm/js/err404/')) {
+                    return true;
+                }
+
+                try {
+                    const parsed = new URL(url, location.origin);
+                    const path = (parsed.pathname || '').toLowerCase();
+                    if (!path.includes('goodsdetail')) {
+                        return false;
+                    }
+                    const iCode = (parsed.searchParams.get('i_code') || '').trim();
+                    if (iCode) {
+                        return !isLikelyMomoIcode(iCode);
+                    }
+                    return !/\/goodsdetail\/[^/?#]+/i.test(path);
+                } catch (error) {
+                    const hasGoodsDetail = /goodsdetail\.jsp/i.test(lowered);
+                    if (!hasGoodsDetail) {
+                        return false;
+                    }
+                    const hasIcode = /[?&]i_code=([^&#]+)/i.test(lowered);
+                    if (!hasIcode) {
+                        return true;
+                    }
+                    const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+                    const extracted = match ? (match[1] || '').trim() : '';
+                    return !isLikelyMomoIcode(extracted);
+                }
+            };
+
+            const isLikelyMomoIcode = function (value) {
+                const cleaned = toText(value).trim();
+                if (!cleaned) {
+                    return false;
+                }
+                const lowered = cleaned.toLowerCase();
+                if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+                    return false;
+                }
+                if (lowered.startsWith('momo_')) {
+                    return false;
+                }
+                return MOMO_CODE_RE.test(cleaned);
+            };
+
+            const getIcodeFromUrl = function (url) {
+                const target = toText(url).trim();
+                if (!target) {
+                    return '';
+                }
+
+                try {
+                    const parsed = new URL(target, location.origin);
+                    const iCode = parsed.searchParams.get('i_code');
+                    if (iCode) {
+                        return iCode.trim();
+                    }
+                } catch (error) {
+                    // ignore
+                }
+
+                const match = /[?&]i_code=([^&#]+)/i.exec(target);
+                return match ? decodeURIComponent(match[1] || '').trim() : '';
+            };
+
+            const buildSafeMomoUrl = function (iCode) {
+                const cleaned = toText(iCode).trim();
+                if (!isLikelyMomoIcode(cleaned)) {
+                    return '';
+                }
+                return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(cleaned)}`;
+            };
+
+            const resolveSafeUrl = function (link, href) {
+                const original = toText(link.dataset && link.dataset.momoOriginalUrl).trim();
+                const explicit = toText(link.dataset && (link.dataset.trackIcode || link.dataset.trackProductId)).trim();
+                const fallbackCode = explicit || getIcodeFromUrl(original) || getIcodeFromUrl(href);
+
+                if (fallbackCode) {
+                    return buildSafeMomoUrl(fallbackCode);
+                }
+                return '#';
+            };
+
+            const openMomoUrl = function (link, url) {
+                if (!url || url === '#') {
+                    return;
+                }
+
+                const target = toText(link.getAttribute('target') || '_self').toLowerCase();
+                if (target === '_blank') {
+                    window.open(url, '_blank', 'noopener,noreferrer');
+                    return;
+                }
+                if (target === '_self' || target === '' ) {
+                    window.location.href = url;
+                    return;
+                }
+                window.open(url, target);
+            };
+
+            const trackMomoLink = function (payload) {
+                const csrfToken = document.querySelector('meta[name="csrf-token"]')?.getAttribute('content');
+                const body = {
+                    status: 'tracked',
+                    ...payload
+                };
+
+                const headers = {
+                    'Content-Type': 'application/json'
+                };
+                if (csrfToken) {
+                    headers['X-CSRFToken'] = csrfToken;
+                }
+
+                fetch('/api/track_momo_link', {
+                    method: 'POST',
+                    headers,
+                    body: JSON.stringify(body),
+                    keepalive: true
+                }).catch(() => {});
+            };
+
+            const guardMomoLink = function (event) {
+                if (event.defaultPrevented) {
+                    return;
+                }
+
+                if (event.type === 'click' && event.button && event.button !== 0) {
+                    return;
+                }
+                if (event.type === 'auxclick' && event.button !== 1) {
+                    return;
+                }
+
+                const link = event.target.closest ? event.target.closest('a') : null;
+                if (!link) {
+                    return;
+                }
+
+                const href = toText(link.getAttribute('href') || '').trim();
+                if (!href || href === '#') {
+                    return;
+                }
+
+                const isTrackedClass = link.classList && link.classList.contains('momo-tracked-link');
+                const raw = toText(link.getAttribute('href') || '').trim();
+                const original = toText(link.dataset && link.dataset.momoOriginalUrl).trim();
+                if (!isTrackedClass && !hasMomoHost(raw) && !hasMomoHost(original)) {
+                    return;
+                }
+
+                const blocked = isBlockedMomoUrl(href) || isBlockedMomoUrl(original);
+                const payload = {
+                    url: original || href,
+                    page: location.pathname,
+                    source: toText(link.dataset && link.dataset.trackSource) || 'auto-guard',
+                    platform: toText(link.dataset && link.dataset.trackPlatform) || 'momo',
+                    product_id: toText(link.dataset && link.dataset.trackProductId) || '',
+                    i_code: toText(link.dataset && link.dataset.trackIcode) || '',
+                    product_name: toText(link.dataset && link.dataset.trackProductName) || '',
+                    label: toText(link.textContent || '').trim(),
+                    effective_url: href,
+                    blocked: blocked
+                };
+
+                if (!blocked && !isTrackedClass) {
+                    return;
+                }
+
+                if (blocked) {
+                    event.preventDefault();
+
+                    const safeUrl = resolveSafeUrl(link, href);
+                    if (safeUrl && safeUrl !== href) {
+                        link.setAttribute('href', safeUrl);
+                        payload.effective_url = safeUrl;
+                        openMomoUrl(link, safeUrl);
+                    }
+
+                    trackMomoLink(payload);
+                    return;
+                }
+
+                trackMomoLink(payload);
+            };
+
+            document.addEventListener('click', guardMomoLink, true);
+            document.addEventListener('auxclick', guardMomoLink, true);
+        })();
+    </script>
+
     <!-- 共用 JavaScript -->
     <script>
         // CSRF Token 設定 (供 AJAX 使用)
diff --git a/templates/dashboard.html b/templates/dashboard.html
index 6679299..d2ccb94 100644
--- a/templates/dashboard.html
+++ b/templates/dashboard.html
@@ -929,8 +929,16 @@
                                         {% endif %}
                                     </div>
                                     <div class="flex-grow-1">
-                                        <a href="{{ item.record.product.url }}" target="_blank"
-                                            class="product-link product-name" title="{{ item.record.product.name|e }}">
+                                        {% set safe_product_url = item.safe_momo_url or '#' %}
+                                    <a href="{{ safe_product_url }}" target="_blank"
+                                        class="product-link product-name momo-tracked-link"
+                                        data-momo-original-url="{{ safe_product_url }}"
+                                        data-track-platform="momo"
+                                        data-track-source="dashboard-legacy-table"
+                                        data-track-product-id="{{ item.record.product.id }}"
+                                            data-track-icode="{{ item.record.product.i_code }}"
+                                            data-track-product-name="{{ item.record.product.name|e }}"
+                                            title="{{ item.record.product.name|e }}">
                                             {{ item.record.product.name }}
                                         </a>
                                         <div class="d-flex align-items-center mt-1">
@@ -1369,8 +1377,8 @@
                             html += `
                                 <tr>
                                     <td><img src="${safeImageUrl}" class="product-thumb" onerror="this.src='/static/placeholder.png'" style="width: 60px; height: 60px; object-fit: cover; border-radius: 8px;"></td>
-                                    <td><a href="${safeUrl}" target="_blank" class="text-decoration-none">${safeProductId}</a></td>
-                                    <td><a href="${safeUrl}" target="_blank" class="text-decoration-none" title="${safeName}">${safeName}</a></td>
+                                    <td><a href="${safeUrl}" target="_blank" class="text-decoration-none momo-tracked-link" data-track-platform="momo" data-track-source="dashboard-legacy-modal" data-track-product-id="${safeProductId}" data-track-icode="${safeProductId}" data-track-product-name="${safeName}" data-momo-original-url="${safeUrl}">${safeProductId}</a></td>
+                                    <td><a href="${safeUrl}" target="_blank" class="text-decoration-none momo-tracked-link" data-track-platform="momo" data-track-source="dashboard-legacy-modal" data-track-product-id="${safeProductId}" data-track-icode="${safeProductId}" data-track-product-name="${safeName}" title="${safeName}" data-momo-original-url="${safeUrl}">${safeName}</a></td>
                                     <td><span class="badge bg-secondary">${safeCategory || '未分類'}</span></td>
                                     <td>$${(p.old_price || 0).toLocaleString()}</td>
                                     <td><strong>$${(p.current_price || 0).toLocaleString()}</strong></td>
@@ -1399,7 +1407,141 @@
 
             window.location.href = `/api/export/price_changes?type=${currentFilterType}&category=${encodeURIComponent(currentFilterCategory)}`;
         }
+
+        function getSafeMomoFallbackUrl(link) {
+            const iCode = (link.dataset.trackIcode || link.dataset.trackProductId || '').trim();
+            const isLikelyMomoIcode = isLikelyMomoProductCode(iCode);
+            if (!isLikelyMomoIcode) {
+                return '#';
+            }
+            return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(iCode)}`;
+        }
+
+        function isLikelyMomoProductCode(value) {
+            const cleaned = (value || '').trim();
+            if (!cleaned) {
+                return false;
+            }
+            const lowered = cleaned.toLowerCase();
+            if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+                return false;
+            }
+            if (lowered.startsWith('momo_') || lowered.startsWith('manual_') || lowered.startsWith('pchome_')) {
+                return false;
+            }
+            return /^[A-Za-z0-9_-]{4,}$/.test(cleaned);
+        }
+
+        function isBlockedMomoUrl(url) {
+            const lowered = (url || '').toLowerCase();
+            if (lowered.includes('ec404.html') || lowered.includes('ec404')) {
+                return true;
+            }
+
+            try {
+                const parsed = new URL(url, location.origin);
+                const path = (parsed.pathname || '').toLowerCase();
+                if (!path.includes('goodsdetail')) {
+                    return false;
+                }
+                const code = (parsed.searchParams.get('i_code') || '').trim();
+                if (code) {
+                    return !isLikelyMomoProductCode(code);
+                }
+                return !/\/goodsdetail\/[^/?#]+/i.test(path);
+            } catch (error) {
+                if (!/goodsdetail\.jsp/i.test(lowered)) {
+                    return false;
+                }
+                const hasCode = /[?&]i_code=([^&#]+)/i.test(lowered);
+                if (!hasCode) {
+                    return true;
+                }
+                const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+                const code = match ? (match[1] || '').trim() : '';
+                return !isLikelyMomoProductCode(code);
+            }
+        }
+
+        function openMomoUrl(link, url) {
+            if (!url || url === '#') {
+                return;
+            }
+
+            const target = (link.getAttribute('target') || '_self').toLowerCase();
+            if (target === '_blank') {
+                window.open(url, '_blank', 'noopener,noreferrer');
+                return;
+            }
+
+            if (target === '_self' || target === '') {
+                window.location.href = url;
+                return;
+            }
+
+            window.open(url, target);
+        }
+
+        function trackMomoLinkClick(event) {
+            const link = event.target.closest('.momo-tracked-link');
+            if (!link) {
+                return;
+            }
+
+            const href = link.getAttribute('href') || '';
+            const originalHref = link.dataset.momoOriginalUrl || href;
+            if (!href || href === '#') {
+                return;
+            }
+
+            const isBlocked = isBlockedMomoUrl(href);
+
+            const payload = {
+                url: originalHref,
+                page: location.pathname,
+                source: link.dataset.trackSource || 'unknown',
+                platform: link.dataset.trackPlatform || 'momo',
+                product_id: link.dataset.trackProductId || '',
+                i_code: link.dataset.trackIcode || '',
+                product_name: link.dataset.trackProductName || '',
+                label: (link.textContent || '').trim(),
+                effective_url: href
+            };
+
+            if (isBlocked) {
+                console.warn('[Dashboard] 嘗試打開 MOMO 404 網址', payload);
+                event.preventDefault();
+
+                const fallbackUrl = link.dataset.momoFallbackUrl || getSafeMomoFallbackUrl(link);
+                if (fallbackUrl && fallbackUrl !== '#' && fallbackUrl !== href) {
+                    link.dataset.momoFallbackUrl = fallbackUrl;
+                    link.setAttribute('href', fallbackUrl);
+                    payload.effective_url = fallbackUrl;
+                    openMomoUrl(link, fallbackUrl);
+                    fetch('/api/track_momo_link', {
+                        method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/json',
+                            'X-CSRFToken': getCSRFToken()
+                        },
+                        body: JSON.stringify(payload)
+                    }).catch(() => {});
+                    return;
+                }
+            }
+
+            fetch('/api/track_momo_link', {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                    'X-CSRFToken': getCSRFToken()
+                },
+                body: JSON.stringify(payload)
+            }).catch(() => {});
+        }
+
+        document.addEventListener('click', trackMomoLinkClick);
     </script>
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/templates/dashboard_v2.html b/templates/dashboard_v2.html
index e086c8d..821abcc 100644
--- a/templates/dashboard_v2.html
+++ b/templates/dashboard_v2.html
@@ -959,7 +959,12 @@
                     <div class="dashboard-focus-list">
                         {% for pick in overview.top_picks %}
                             <div class="dashboard-focus-row">
-                                <a class="dashboard-focus-row-title" href="{{ pick.momo_url }}" target="_blank" rel="noopener noreferrer">{{ pick.name }}</a>
+                                <a class="dashboard-focus-row-title momo-tracked-link" href="{{ pick.momo_url or '#' }}" data-momo-original-url="{{ pick.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                    data-track-platform="momo"
+                                    data-track-source="dashboard-v2-overview-top-picks"
+                                    data-track-product-id="{{ pick.sku }}"
+                                    data-track-icode="{{ pick.sku }}"
+                                    data-track-product-name="{{ pick.name|e }}">{{ pick.name }}</a>
                                 <div class="dashboard-focus-row-meta momo-mono">
                                     <span class="dashboard-focus-chip is-win">AI {{ (pick.confidence * 100) | round(0) | int if pick.confidence else 0 }}%</span>
                                     <span>證據 {{ pick.evidence_quality | round(0) | int }}%</span>
@@ -976,7 +981,12 @@
                                     </div>
                                 {% endif %}
                                 <div class="dashboard-focus-row-links">
-                                    <a class="dashboard-platform-link is-momo" href="{{ pick.momo_url }}" target="_blank" rel="noopener noreferrer">MOMO {{ pick.sku }}</a>
+                                    <a class="dashboard-platform-link is-momo momo-tracked-link" href="{{ pick.momo_url or '#' }}" data-momo-original-url="{{ pick.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                        data-track-platform="momo"
+                                        data-track-source="dashboard-v2-overview-top-picks"
+                                        data-track-product-id="{{ pick.sku }}"
+                                        data-track-icode="{{ pick.sku }}"
+                                        data-track-product-name="{{ pick.name|e }}">MOMO {{ pick.sku }}</a>
                                     {% if pick.pchome_url %}
                                         <a class="dashboard-platform-link is-pchome" href="{{ pick.pchome_url }}" target="_blank" rel="noopener noreferrer">PChome {{ pick.pchome_id }}</a>
                                     {% endif %}
@@ -996,14 +1006,24 @@
                     <div class="dashboard-focus-list">
                         {% for item in overview.top_momo_threats %}
                             <div class="dashboard-focus-row">
-                                <a class="dashboard-focus-row-title" href="{{ item.momo_url }}" target="_blank" rel="noopener noreferrer">{{ item.name }}</a>
+                                <a class="dashboard-focus-row-title momo-tracked-link" href="{{ item.momo_url or '#' }}" data-momo-original-url="{{ item.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                    data-track-platform="momo"
+                                    data-track-source="dashboard-v2-overview-top-momo-threats"
+                                    data-track-product-id="{{ item.sku }}"
+                                    data-track-icode="{{ item.sku }}"
+                                    data-track-product-name="{{ item.name|e }}">{{ item.name }}</a>
                                 <div class="dashboard-focus-row-meta momo-mono">
                                     <span class="dashboard-focus-chip is-risk">{{ item.gap_pct | round(1) }}%</span>
                                     <span>MOMO ${{ item.momo_price | int | number_format }}</span>
                                     <span>PChome ${{ item.pchome_price | int | number_format }}</span>
                                 </div>
                                 <div class="dashboard-focus-row-links">
-                                    <a class="dashboard-platform-link is-momo" href="{{ item.momo_url }}" target="_blank" rel="noopener noreferrer">MOMO {{ item.sku }}</a>
+                                    <a class="dashboard-platform-link is-momo momo-tracked-link" href="{{ item.momo_url or '#' }}" data-momo-original-url="{{ item.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                        data-track-platform="momo"
+                                        data-track-source="dashboard-v2-overview-top-momo-threats"
+                                        data-track-product-id="{{ item.sku }}"
+                                        data-track-icode="{{ item.sku }}"
+                                        data-track-product-name="{{ item.name|e }}">MOMO {{ item.sku }}</a>
                                     {% if item.pchome_url %}
                                         <a class="dashboard-platform-link is-pchome" href="{{ item.pchome_url }}" target="_blank" rel="noopener noreferrer">PChome {{ item.pchome_id }}</a>
                                     {% endif %}
@@ -1023,14 +1043,24 @@
                     <div class="dashboard-focus-list">
                         {% for item in overview.pending_priority %}
                             <div class="dashboard-focus-row">
-                                <a class="dashboard-focus-row-title" href="{{ item.momo_url }}" target="_blank" rel="noopener noreferrer">{{ item.name }}</a>
+                                <a class="dashboard-focus-row-title momo-tracked-link" href="{{ item.momo_url or '#' }}" data-momo-original-url="{{ item.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                    data-track-platform="momo"
+                                    data-track-source="dashboard-v2-overview-pending-priority"
+                                    data-track-product-id="{{ item.sku }}"
+                                    data-track-icode="{{ item.sku }}"
+                                    data-track-product-name="{{ item.name|e }}">{{ item.name }}</a>
                                 <div class="dashboard-focus-row-meta momo-mono">
                                     <span class="dashboard-focus-chip is-neutral">待比對</span>
                                     <span>MOMO ${{ item.momo_price | int | number_format }}</span>
                                     <span>{{ item.category or '未分類' }}</span>
                                 </div>
                                 <div class="dashboard-focus-row-links">
-                                    <a class="dashboard-platform-link is-momo" href="{{ item.momo_url }}" target="_blank" rel="noopener noreferrer">MOMO {{ item.sku }}</a>
+                                    <a class="dashboard-platform-link is-momo momo-tracked-link" href="{{ item.momo_url or '#' }}" data-momo-original-url="{{ item.momo_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                        data-track-platform="momo"
+                                        data-track-source="dashboard-v2-overview-pending-priority"
+                                        data-track-product-id="{{ item.sku }}"
+                                        data-track-icode="{{ item.sku }}"
+                                        data-track-product-name="{{ item.name|e }}">MOMO {{ item.sku }}</a>
                                     <span class="dashboard-platform-muted">PChome 待比對</span>
                                 </div>
                             </div>
@@ -1194,10 +1224,23 @@
                                 <td>
                                     <div class="dashboard-product-cell">
                                         <img class="dashboard-product-thumb" src="{{ image_url }}" alt="{{ product.name }}" loading="lazy" referrerpolicy="no-referrer">
+                                        {% set safe_product_url = item.safe_momo_url or '#' %}
+                                    <a class="dashboard-product-name momo-tracked-link" href="{{ safe_product_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                        data-momo-original-url="{{ safe_product_url or '#' }}"
+                                            data-track-platform="momo"
+                                            data-track-source="dashboard-v2-table-main"
+                                            data-track-product-id="{{ product.id }}"
+                                            data-track-icode="{{ product.i_code }}"
+                                            data-track-product-name="{{ product.name|e }}">{{ product.name }}</a>
                                         <div>
-                                            <a class="dashboard-product-name" href="{{ product.url }}" target="_blank" rel="noopener noreferrer">{{ product.name }}</a>
                                             <div class="dashboard-platform-links">
-                                                <a class="dashboard-platform-link is-momo" href="{{ product.url }}" target="_blank" rel="noopener noreferrer">
+                                                <a class="dashboard-platform-link is-momo momo-tracked-link" href="{{ safe_product_url or '#' }}" target="_blank" rel="noopener noreferrer"
+                                                    data-momo-original-url="{{ safe_product_url or '#' }}"
+                                                    data-track-platform="momo"
+                                                    data-track-source="dashboard-v2-table-main"
+                                                    data-track-product-id="{{ product.id }}"
+                                                    data-track-icode="{{ product.i_code }}"
+                                                    data-track-product-name="{{ product.name|e }}">
                                                     MOMO {{ product.i_code }}
                                                 </a>
                                                 {% if competitor and competitor.product_url %}
@@ -1612,5 +1655,137 @@
                 .catch(error => alert('錯誤: ' + error));
         }
     }
+
+        function trackMomoLinkClick(event) {
+            const link = event.target.closest('.momo-tracked-link');
+            if (!link) {
+                return;
+            }
+
+        const href = link.getAttribute('href') || '';
+        const originalHref = link.dataset.momoOriginalUrl || href;
+        if (!href || href === '#') {
+            return;
+        }
+
+        const isBlocked = isBlockedMomoUrl(href);
+
+        const payload = {
+            url: originalHref,
+            page: location.pathname,
+            source: link.dataset.trackSource || 'unknown',
+            platform: link.dataset.trackPlatform || 'momo',
+            product_id: link.dataset.trackProductId || '',
+            i_code: link.dataset.trackIcode || '',
+            product_name: link.dataset.trackProductName || '',
+            label: (link.textContent || '').trim(),
+            effective_url: href
+        };
+
+        if (isBlocked) {
+            console.warn('[DashboardV2] 嘗試打開 MOMO 404 網址', payload);
+            event.preventDefault();
+
+            const fallbackUrl = link.dataset.momoFallbackUrl || getSafeMomoFallbackUrl(link);
+            if (fallbackUrl && fallbackUrl !== '#' && fallbackUrl !== href) {
+                link.dataset.momoFallbackUrl = fallbackUrl;
+                link.setAttribute('href', fallbackUrl);
+                payload.effective_url = fallbackUrl;
+                openMomoUrl(link, fallbackUrl);
+                fetch('/api/track_momo_link', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRFToken': getCSRFToken()
+                    },
+                    body: JSON.stringify(payload)
+                }).catch(() => {});
+                return;
+            }
+        }
+
+        fetch('/api/track_momo_link', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                'X-CSRFToken': getCSRFToken()
+            },
+            body: JSON.stringify(payload)
+        }).catch(() => {});
+    }
+
+        function getSafeMomoFallbackUrl(link) {
+            const iCode = (link.dataset.trackIcode || link.dataset.trackProductId || '').trim();
+            if (!isLikelyMomoProductCode(iCode)) {
+                return '#';
+            }
+            return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(iCode)}`;
+        }
+
+        function openMomoUrl(link, url) {
+            if (!url || url === '#') {
+                return;
+            }
+
+            const target = (link.getAttribute('target') || '_self').toLowerCase();
+            if (target === '_blank') {
+                window.open(url, '_blank', 'noopener,noreferrer');
+                return;
+            }
+
+            if (target === '_self' || target === '') {
+                window.location.href = url;
+                return;
+            }
+
+            window.open(url, target);
+        }
+
+        function isBlockedMomoUrl(url) {
+            const lowered = (url || '').toLowerCase();
+            if (lowered.includes('EC404.html') || lowered.includes('ec404')) {
+                return true;
+            }
+            try {
+                const parsed = new URL(url, location.origin);
+                const path = (parsed.pathname || '').toLowerCase();
+                if (!path.includes('goodsdetail')) {
+                    return false;
+                }
+                const code = (parsed.searchParams.get('i_code') || '').trim();
+                if (code) {
+                    return !isLikelyMomoProductCode(code);
+                }
+                return !/\/goodsdetail\/[^/?#]+/i.test(path);
+            } catch (error) {
+                if (!/goodsdetail\.jsp/i.test(lowered)) {
+                    return false;
+                }
+                const hasCode = /[?&]i_code=([^&#]+)/i.test(lowered);
+                if (!hasCode) {
+                    return true;
+                }
+                const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+                const code = match ? (match[1] || '').trim() : '';
+                return !isLikelyMomoProductCode(code);
+            }
+        }
+
+        function isLikelyMomoProductCode(value) {
+            const cleaned = (value || '').trim();
+            if (!cleaned) {
+                return false;
+            }
+            const lowered = cleaned.toLowerCase();
+            if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+                return false;
+            }
+            if (lowered.startsWith('momo_') || lowered.startsWith('manual_') || lowered.startsWith('pchome_')) {
+                return false;
+            }
+            return /^[A-Za-z0-9_-]{4,}$/.test(cleaned);
+        }
+
+    document.addEventListener('click', trackMomoLinkClick);
 </script>
 {% endblock %}
diff --git a/templates/edm_dashboard.html b/templates/edm_dashboard.html
index a28042a..427e12f 100644
--- a/templates/edm_dashboard.html
+++ b/templates/edm_dashboard.html
@@ -256,7 +256,12 @@
                                                 {% endif %}
                                             </div>
                                             <div class="flex-grow-1">
-                                                <a href="{{ item.url or '#' }}" target="_blank" class="product-link" title="{{ item.name }}">
+                                                <a href="{{ item.safe_product_url or '#' }}" target="_blank" class="product-link momo-tracked-link" title="{{ item.name }}" data-momo-original-url="{{ item.safe_product_url or '#' }}"
+                                                    data-track-platform="momo"
+                                                    data-track-source="edm-dashboard-table"
+                                                    data-track-product-id="{{ item.i_code }}"
+                                                    data-track-icode="{{ item.i_code }}"
+                                                    data-track-product-name="{{ item.name|e }}">
                                                     {{ item.name }}
                                                 </a>
                                                 <div class="d-flex align-items-center flex-wrap gap-2">
@@ -426,6 +431,138 @@
                 document.body.removeChild(textArea);
             }
         }
+
+        function trackMomoLinkClick(event) {
+            const link = event.target.closest('.momo-tracked-link');
+            if (!link) {
+                return;
+            }
+
+            const href = link.getAttribute('href') || '';
+            const originalHref = link.dataset.momoOriginalUrl || href;
+            if (!href || href === '#') {
+                return;
+            }
+
+            const payload = {
+                url: originalHref,
+                page: location.pathname,
+                source: link.dataset.trackSource || 'unknown',
+                platform: link.dataset.trackPlatform || 'momo',
+                product_id: link.dataset.trackProductId || '',
+                i_code: link.dataset.trackIcode || '',
+                product_name: link.dataset.trackProductName || '',
+                label: (link.textContent || '').trim(),
+                effective_url: href
+            };
+
+            const isBlocked = isBlockedMomoUrl(href);
+
+        if (isBlocked) {
+            console.warn('[EDM Dashboard] 嘗試打開 MOMO 404 網址', payload);
+            event.preventDefault();
+
+            const fallbackUrl = link.dataset.momoFallbackUrl || getSafeMomoFallbackUrl(link);
+            if (fallbackUrl && fallbackUrl !== '#' && fallbackUrl !== href) {
+                link.dataset.momoFallbackUrl = fallbackUrl;
+                link.setAttribute('href', fallbackUrl);
+                payload.effective_url = fallbackUrl;
+                openMomoUrl(link, fallbackUrl);
+                fetch('/api/track_momo_link', {
+                    method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/json',
+                            'X-CSRFToken': getCSRFToken()
+                        },
+                        body: JSON.stringify(payload)
+                    }).catch(() => {});
+                    return;
+                }
+            }
+
+            fetch('/api/track_momo_link', {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                    'X-CSRFToken': getCSRFToken()
+                },
+                body: JSON.stringify(payload)
+            }).catch(() => {});
+        }
+
+        function getSafeMomoFallbackUrl(link) {
+            const iCode = (link.dataset.trackIcode || link.dataset.trackProductId || '').trim();
+            if (!isLikelyMomoProductCode(iCode)) {
+                return '#';
+            }
+            return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(iCode)}`;
+        }
+
+        function isBlockedMomoUrl(url) {
+            const lowered = (url || '').toLowerCase();
+            if (lowered.includes('EC404.html') || lowered.includes('ec404')) {
+                return true;
+            }
+            try {
+                const parsed = new URL(url, location.origin);
+                const path = (parsed.pathname || '').toLowerCase();
+                if (!path.includes('goodsdetail')) {
+                    return false;
+                }
+                const code = (parsed.searchParams.get('i_code') || '').trim();
+                if (code) {
+                    return !isLikelyMomoProductCode(code);
+                }
+                return !/\/goodsdetail\/[^/?#]+/i.test(path);
+            } catch (error) {
+                if (!/goodsdetail\.jsp/i.test(lowered)) {
+                    return false;
+                }
+                const hasCode = /[?&]i_code=([^&#]+)/i.test(lowered);
+                if (!hasCode) {
+                    return true;
+                }
+                const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+                const code = match ? (match[1] || '').trim() : '';
+                return !isLikelyMomoProductCode(code);
+            }
+        }
+
+        function openMomoUrl(link, url) {
+            if (!url || url === '#') {
+                return;
+            }
+
+            const target = (link.getAttribute('target') || '_self').toLowerCase();
+            if (target === '_blank') {
+                window.open(url, '_blank', 'noopener,noreferrer');
+                return;
+            }
+
+            if (target === '_self' || target === '') {
+                window.location.href = url;
+                return;
+            }
+
+            window.open(url, target);
+        }
+
+        document.addEventListener('click', trackMomoLinkClick);
+
+        function isLikelyMomoProductCode(value) {
+            const cleaned = (value || '').trim();
+            if (!cleaned) {
+                return false;
+            }
+            const lowered = cleaned.toLowerCase();
+            if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+                return false;
+            }
+            if (lowered.startsWith('momo_') || lowered.startsWith('manual_') || lowered.startsWith('pchome_')) {
+                return false;
+            }
+            return /^[A-Za-z0-9_-]{4,}$/.test(cleaned);
+        }
     </script>
 </body>
 </html>
diff --git a/templates/edm_dashboard_v2.html b/templates/edm_dashboard_v2.html
index 655994e..dab1da0 100644
--- a/templates/edm_dashboard_v2.html
+++ b/templates/edm_dashboard_v2.html
@@ -893,7 +893,12 @@
                                                         <div class="campaign-product-thumb d-flex align-items-center justify-content-center" style="color:var(--momo-text-tertiary);font-size:11px;">無圖</div>
                                                     {% endif %}
                                                     <div>
-                                                        <a class="campaign-product-name" href="{{ item.url or '#' }}" target="_blank" rel="noopener noreferrer">{{ item.name }}</a>
+                                                        <a class="campaign-product-name momo-tracked-link" href="{{ item.safe_product_url or '#' }}" target="_blank" rel="noopener noreferrer" data-momo-original-url="{{ item.safe_product_url or '#' }}"
+                                                            data-track-platform="momo"
+                                                            data-track-source="edm-dashboard-v2-table"
+                                                            data-track-product-id="{{ item.i_code }}"
+                                                            data-track-icode="{{ item.i_code }}"
+                                                            data-track-product-name="{{ item.name|e }}">{{ item.name }}</a>
                                                         <button
                                                             class="campaign-product-id"
                                                             type="button"
@@ -1326,5 +1331,137 @@
                 .catch(error => alert('錯誤: ' + error));
         }
     }
+
+    function trackMomoLinkClick(event) {
+        const link = event.target.closest('.momo-tracked-link');
+        if (!link) {
+            return;
+        }
+
+        const href = link.getAttribute('href') || '';
+        const originalHref = link.dataset.momoOriginalUrl || href;
+        if (!href || href === '#') {
+            return;
+        }
+
+        const payload = {
+            url: originalHref,
+            page: location.pathname,
+            source: link.dataset.trackSource || 'unknown',
+            platform: link.dataset.trackPlatform || 'momo',
+            product_id: link.dataset.trackProductId || '',
+            i_code: link.dataset.trackIcode || '',
+            product_name: link.dataset.trackProductName || '',
+            label: (link.textContent || '').trim(),
+            effective_url: href
+        };
+
+        const isBlocked = isBlockedMomoUrl(href);
+
+        if (isBlocked) {
+            console.warn('[EDM Dashboard V2] 嘗試打開 MOMO 404 網址', payload);
+            event.preventDefault();
+
+            const fallbackUrl = link.dataset.momoFallbackUrl || getSafeMomoFallbackUrl(link);
+            if (fallbackUrl && fallbackUrl !== '#' && fallbackUrl !== href) {
+                link.dataset.momoFallbackUrl = fallbackUrl;
+                link.setAttribute('href', fallbackUrl);
+                payload.effective_url = fallbackUrl;
+                openMomoUrl(link, fallbackUrl);
+                fetch('/api/track_momo_link', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRFToken': getCSRFToken()
+                    },
+                    body: JSON.stringify(payload)
+                }).catch(() => {});
+                return;
+            }
+        }
+
+        fetch('/api/track_momo_link', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                'X-CSRFToken': getCSRFToken()
+            },
+            body: JSON.stringify(payload)
+        }).catch(() => {});
+    }
+
+    function getSafeMomoFallbackUrl(link) {
+        const iCode = (link.dataset.trackIcode || link.dataset.trackProductId || '').trim();
+        if (!isLikelyMomoProductCode(iCode)) {
+            return '#';
+        }
+        return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(iCode)}`;
+    }
+
+    function isBlockedMomoUrl(url) {
+        const lowered = (url || '').toLowerCase();
+        if (lowered.includes('EC404.html') || lowered.includes('ec404')) {
+            return true;
+        }
+        try {
+            const parsed = new URL(url, location.origin);
+            const path = (parsed.pathname || '').toLowerCase();
+            if (!path.includes('goodsdetail')) {
+                return false;
+            }
+            const code = (parsed.searchParams.get('i_code') || '').trim();
+            if (code) {
+                return !isLikelyMomoProductCode(code);
+            }
+            return !/\/goodsdetail\/[^/?#]+/i.test(path);
+        } catch (error) {
+            if (!/goodsdetail\.jsp/i.test(lowered)) {
+                return false;
+            }
+            const hasCode = /[?&]i_code=([^&#]+)/i.test(lowered);
+            if (!hasCode) {
+                return true;
+            }
+            const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+            const code = match ? (match[1] || '').trim() : '';
+            return !isLikelyMomoProductCode(code);
+        }
+    }
+
+    function isLikelyMomoProductCode(value) {
+        const cleaned = (value || '').trim();
+        if (!cleaned) {
+            return false;
+        }
+        const lowered = cleaned.toLowerCase();
+        if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+            return false;
+        }
+        if (lowered.startsWith('momo_') || lowered.startsWith('manual_') || lowered.startsWith('pchome_')) {
+            return false;
+        }
+        return /^[A-Za-z0-9_-]{4,}$/.test(cleaned);
+    }
+
+    function openMomoUrl(link, url) {
+        if (!url || url === '#') {
+            return;
+        }
+
+        const target = (link.getAttribute('target') || '_self').toLowerCase();
+        if (target === '_blank') {
+            window.open(url, '_blank', 'noopener,noreferrer');
+            return;
+        }
+
+        if (target === '_self' || target === '') {
+            window.location.href = url;
+            return;
+        }
+
+        window.open(url, target);
+    }
+
+    document.addEventListener('click', trackMomoLinkClick);
 </script>
 {% endblock %}
diff --git a/templates/ewoooc_base.html b/templates/ewoooc_base.html
index 29e2380..646b9eb 100644
--- a/templates/ewoooc_base.html
+++ b/templates/ewoooc_base.html
@@ -74,6 +74,226 @@
     </div>
 
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+
+    <!-- MOMO 404 防呆攔截：避免自動打開 EC404 頁面 -->
+    <script>
+        (function () {
+            if (window.__momoLinkGuardInstalled) {
+                return;
+            }
+            window.__momoLinkGuardInstalled = true;
+
+            const MOMO_HOSTS = new Set(['www.momoshop.com.tw', 'm.momoshop.com.tw']);
+            const MOMO_CODE_RE = /^[A-Za-z0-9_-]{4,}$/;
+
+            const toText = value => (value == null ? '' : String(value));
+
+            const hasMomoHost = function (url) {
+                const target = toText(url).trim();
+                if (!target) {
+                    return false;
+                }
+                try {
+                    const parsed = new URL(target, location.origin);
+                    return MOMO_HOSTS.has((parsed.hostname || '').toLowerCase());
+                } catch (error) {
+                    return /(^|\/)m(?:\.momoshop\.com\.tw|\.momoshop\.com\.tw)(\/|$)|www\.momoshop\.com\.tw/i.test(target);
+                }
+            };
+
+            const isBlockedMomoUrl = function (url) {
+                const lowered = toText(url).toLowerCase();
+                if (lowered.includes('ec404.html') || lowered.includes('/ecm/js/err404/')) {
+                    return true;
+                }
+
+                try {
+                    const parsed = new URL(url, location.origin);
+                    const path = (parsed.pathname || '').toLowerCase();
+                    if (!path.includes('goodsdetail')) {
+                        return false;
+                    }
+                    const iCode = (parsed.searchParams.get('i_code') || '').trim();
+                    if (iCode) {
+                        return !isLikelyMomoIcode(iCode);
+                    }
+                    return !/\/goodsdetail\/[^/?#]+/i.test(path);
+                } catch (error) {
+                    const hasGoodsDetail = /goodsdetail\.jsp/i.test(lowered);
+                    if (!hasGoodsDetail) {
+                        return false;
+                    }
+                    const hasIcode = /[?&]i_code=([^&#]+)/i.test(lowered);
+                    if (!hasIcode) {
+                        return true;
+                    }
+                    const match = /[?&]i_code=([^&#]+)/i.exec(lowered);
+                    const extracted = match ? (match[1] || '').trim() : '';
+                    return !isLikelyMomoIcode(extracted);
+                }
+            };
+
+            const isLikelyMomoIcode = function (value) {
+                const cleaned = toText(value).trim();
+                if (!cleaned) {
+                    return false;
+                }
+                const lowered = cleaned.toLowerCase();
+                if (lowered === 'nan' || lowered === 'none' || lowered === 'null' || lowered === 'undefined') {
+                    return false;
+                }
+                if (lowered.startsWith('momo_')) {
+                    return false;
+                }
+                return MOMO_CODE_RE.test(cleaned);
+            };
+
+            const getIcodeFromUrl = function (url) {
+                const target = toText(url).trim();
+                if (!target) {
+                    return '';
+                }
+
+                try {
+                    const parsed = new URL(target, location.origin);
+                    const iCode = parsed.searchParams.get('i_code');
+                    if (iCode) {
+                        return iCode.trim();
+                    }
+                } catch (error) {
+                    // ignore
+                }
+
+                const match = /[?&]i_code=([^&#]+)/i.exec(target);
+                return match ? decodeURIComponent(match[1] || '').trim() : '';
+            };
+
+            const buildSafeMomoUrl = function (iCode) {
+                const cleaned = toText(iCode).trim();
+                if (!isLikelyMomoIcode(cleaned)) {
+                    return '';
+                }
+                return `https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=${encodeURIComponent(cleaned)}`;
+            };
+
+            const resolveSafeUrl = function (link, href) {
+                const original = toText(link.dataset && link.dataset.momoOriginalUrl).trim();
+                const explicit = toText(link.dataset && (link.dataset.trackIcode || link.dataset.trackProductId)).trim();
+                const fallbackCode = explicit || getIcodeFromUrl(original) || getIcodeFromUrl(href);
+
+                if (fallbackCode) {
+                    return buildSafeMomoUrl(fallbackCode);
+                }
+                return '#';
+            };
+
+            const openMomoUrl = function (link, url) {
+                if (!url || url === '#') {
+                    return;
+                }
+
+                const target = toText(link.getAttribute('target') || '_self').toLowerCase();
+                if (target === '_blank') {
+                    window.open(url, '_blank', 'noopener,noreferrer');
+                    return;
+                }
+                if (target === '_self' || target === '' ) {
+                    window.location.href = url;
+                    return;
+                }
+                window.open(url, target);
+            };
+
+            const trackMomoLink = function (payload) {
+                const csrfToken = document.querySelector('meta[name="csrf-token"]')?.getAttribute('content');
+                const body = {
+                    status: 'tracked',
+                    ...payload
+                };
+
+                const headers = {
+                    'Content-Type': 'application/json'
+                };
+                if (csrfToken) {
+                    headers['X-CSRFToken'] = csrfToken;
+                }
+
+                fetch('/api/track_momo_link', {
+                    method: 'POST',
+                    headers,
+                    body: JSON.stringify(body),
+                    keepalive: true
+                }).catch(() => {});
+            };
+
+            const guardMomoLink = function (event) {
+                if (event.defaultPrevented) {
+                    return;
+                }
+
+                if (event.type === 'click' && event.button && event.button !== 0) {
+                    return;
+                }
+                if (event.type === 'auxclick' && event.button !== 1) {
+                    return;
+                }
+
+                const link = event.target.closest ? event.target.closest('a') : null;
+                if (!link) {
+                    return;
+                }
+
+                const href = toText(link.getAttribute('href') || '').trim();
+                if (!href || href === '#') {
+                    return;
+                }
+
+                const isTrackedClass = link.classList && link.classList.contains('momo-tracked-link');
+                const raw = toText(link.getAttribute('href') || '').trim();
+                const original = toText(link.dataset && link.dataset.momoOriginalUrl).trim();
+                if (!isTrackedClass && !hasMomoHost(raw) && !hasMomoHost(original)) {
+                    return;
+                }
+
+                const blocked = isBlockedMomoUrl(href) || isBlockedMomoUrl(original);
+                const payload = {
+                    url: original || href,
+                    page: location.pathname,
+                    source: toText(link.dataset && link.dataset.trackSource) || 'auto-guard',
+                    platform: toText(link.dataset && link.dataset.trackPlatform) || 'momo',
+                    product_id: toText(link.dataset && link.dataset.trackProductId) || '',
+                    i_code: toText(link.dataset && link.dataset.trackIcode) || '',
+                    product_name: toText(link.dataset && link.dataset.trackProductName) || '',
+                    label: toText(link.textContent || '').trim(),
+                    effective_url: href,
+                    blocked: blocked
+                };
+
+                if (!blocked && !isTrackedClass) {
+                    return;
+                }
+
+                if (blocked) {
+                    event.preventDefault();
+
+                    const safeUrl = resolveSafeUrl(link, href);
+                    if (safeUrl && safeUrl !== href) {
+                        link.setAttribute('href', safeUrl);
+                        payload.effective_url = safeUrl;
+                        openMomoUrl(link, safeUrl);
+                    }
+
+                    trackMomoLink(payload);
+                    return;
+                }
+
+                trackMomoLink(payload);
+            };
+
+            document.addEventListener('click', guardMomoLink, true);
+            document.addEventListener('auxclick', guardMomoLink, true);
+        })();
+    </script>
     <script>
         const csrfToken = document.querySelector('meta[name="csrf-token"]')?.getAttribute('content');
 
diff --git a/templates/price_comparison.html b/templates/price_comparison.html
index 6c80de2..cb1b983 100644
--- a/templates/price_comparison.html
+++ b/templates/price_comparison.html
@@ -408,11 +408,16 @@ La Roche-Posay 安得利防曬液 50ml,920
                 return;
             }
 
+            const rawUrl = parts[2]?.trim() || '';
+            const productId = currentManualSource === 'momo'
+                ? extractMomoCodeFromUrl(rawUrl)
+                : `manual_${i}`;
+
             products.push({
                 name: parts[0].trim(),
                 price: price,
-                product_id: `manual_${i}`,
-                url: parts[2]?.trim() || ''
+                product_id: productId,
+                url: rawUrl
             });
         }
 
@@ -509,7 +514,19 @@ La Roche-Posay 安得利防曬液 50ml,920
                             </small>
                             <small class="text-muted">${m.momo.product_id || ''}</small>
                         </div>
-                        ${momoUrl ? `<a href="${momoUrl}" target="_blank" class="btn btn-sm btn-outline-warning ms-1" title="前往 MOMO 查看"><i class="fas fa-external-link-alt"></i></a>` : ''}
+                        ${momoUrl ? `<a
+                            href="${momoUrl}"
+                            target="_blank"
+                            class="btn btn-sm btn-outline-warning ms-1 momo-tracked-link"
+                            title="前往 MOMO 查看"
+                            data-momo-original-url="${momoUrl}"
+                            data-track-platform="momo"
+                            data-track-source="price-comparison"
+                            data-track-product-id="${escapeHtml((m.momo.product_id || '').toString())}"
+                            data-track-icode="${escapeHtml((m.momo.product_id || '').toString())}"
+                            data-track-product-name="${escapeHtml(m.momo.name)}">
+                            <i class="fas fa-external-link-alt"></i>
+                        </a>` : ''}
                     </div>
                 </td>
                 <td class="text-center ${similarityClass}">
@@ -582,6 +599,24 @@ La Roche-Posay 安得利防曬液 50ml,920
         return div.innerHTML;
     }
 
+    function extractMomoCodeFromUrl(url) {
+        const target = (url || '').trim();
+        if (!target) {
+            return '';
+        }
+        try {
+            const parsed = new URL(target, location.origin);
+            const iCode = parsed.searchParams.get('i_code');
+            if (iCode) {
+                return iCode.trim();
+            }
+        } catch (error) {
+            // ignore
+        }
+        const match = /[?&]i_code=([^&#]+)/i.exec(target);
+        return match ? decodeURIComponent(match[1] || '').trim() : '';
+    }
+
     function showToast(message, type = 'info') {
         const toast = document.createElement('div');
         toast.className = `alert alert-${type} position-fixed`;
diff --git a/tests/test_momo_url_utils.py b/tests/test_momo_url_utils.py
new file mode 100644
index 0000000..ea66dbf
--- /dev/null
+++ b/tests/test_momo_url_utils.py
@@ -0,0 +1,50 @@
+from utils.momo_url_utils import build_momo_product_url, extract_momo_i_code, is_probable_momo_icode, normalize_momo_product_url
+
+
+def test_build_momo_product_url_from_code():
+    assert build_momo_product_url("12345") == "https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=12345"
+
+
+def test_build_momo_product_url_empty_returns_none():
+    assert build_momo_product_url("") is None
+    assert build_momo_product_url(None) is None
+
+
+def test_normalize_keeps_valid_goodsdetail_url():
+    valid = "https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=12345"
+    assert normalize_momo_product_url(valid, "12345") == valid
+
+
+def test_normalize_falls_back_for_javascript_link():
+    assert normalize_momo_product_url("javascript:void(0)", "12345") == build_momo_product_url("12345")
+
+
+def test_normalize_falls_back_for_err404_page():
+    assert normalize_momo_product_url(
+        "https://www.momoshop.com.tw/ecm/js/err404/EC404.html",
+        "12345",
+    ) == build_momo_product_url("12345")
+
+
+def test_normalize_adds_https_for_protocol_relative_url():
+    assert normalize_momo_product_url("//www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=12345", "12345") == (
+        "https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=12345"
+    )
+
+
+def test_extract_momo_i_code():
+    assert extract_momo_i_code("https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code=12345") == "12345"
+    assert extract_momo_i_code("/goods/GoodsDetail.jsp?i_code=999") == "999"
+    assert extract_momo_i_code("not-a-url") is None
+
+
+def test_invalid_placeholder_codes():
+    assert is_probable_momo_icode("momo_0") is False
+    assert is_probable_momo_icode("manual_123") is False
+    assert is_probable_momo_icode("pchome_1") is False
+    assert is_probable_momo_icode("1234") is True
+
+
+def test_normalize_blocks_goodsdetail_without_i_code():
+    invalid = "https://www.momoshop.com.tw/goods/GoodsDetail.jsp?foo=1"
+    assert normalize_momo_product_url(invalid, "12345") == build_momo_product_url("12345")
diff --git a/utils/momo_url_utils.py b/utils/momo_url_utils.py
new file mode 100644
index 0000000..6de35b6
--- /dev/null
+++ b/utils/momo_url_utils.py
@@ -0,0 +1,146 @@
+"""Utilities for MOMO product URL normalization and fallback."""
+
+import re
+from typing import Optional
+from urllib.parse import parse_qs, urlparse, urlunparse
+
+MOMO_BASE_DOMAINS = {
+    'www.momoshop.com.tw',
+    'm.momoshop.com.tw',
+}
+
+ERR404_PATH = '/ecm/js/err404/ec404.html'
+MOMO_ICODE_FALLBACK_MIN_LEN = 4
+MOMO_ICODE_RE = re.compile(r'^[A-Za-z0-9_-]+$')
+
+
+def is_probable_momo_icode(i_code: Optional[object]) -> bool:
+    """判斷值是否像是合理的 MOMO 商品代碼。"""
+    cleaned = str(i_code or '').strip()
+    if not cleaned:
+        return False
+
+    lowered = cleaned.lower()
+    if lowered in {'nan', 'none', 'null', 'undefined'}:
+        return False
+
+    if lowered.startswith(('momo_', 'manual_', 'pchome_')):
+        return False
+
+    if len(cleaned) < MOMO_ICODE_FALLBACK_MIN_LEN:
+        return False
+
+    return bool(MOMO_ICODE_RE.fullmatch(cleaned))
+
+
+def build_momo_product_url(i_code: Optional[object]) -> Optional[str]:
+    """Build fallback MOMO product detail URL from i_code."""
+    if not is_probable_momo_icode(i_code):
+        return None
+    return f"https://www.momoshop.com.tw/goods/GoodsDetail.jsp?i_code={str(i_code).strip()}"
+
+
+def extract_momo_i_code(url: Optional[object]) -> Optional[str]:
+    """從 URL 萃取 i_code。"""
+    if not url:
+        return None
+
+    raw = str(url).strip()
+    if not raw:
+        return None
+
+    # URL 格式：直接解析
+    try:
+        normalized = raw if raw.startswith(('http://', 'https://')) else (
+            f'https:{raw}' if raw.startswith('//') else raw
+        )
+        parsed = urlparse(normalized)
+        if parsed.scheme in ('http', 'https'):
+            query = parse_qs(parsed.query or '')
+            i_code = (query.get('i_code') or [''])[0]
+            if i_code:
+                return i_code.strip()
+
+            match = re.search(r'/goodsdetail/([^/?#]+)', parsed.path or '', re.I)
+            if match:
+                return match.group(1).strip()
+    except Exception:
+        pass
+
+    # 備援匹配
+    match = re.search(r'[?&]i_code=([^&#]+)', raw, re.I)
+    if match:
+        return match.group(1).strip()
+
+    return None
+
+
+def _normalize_quoted_url(url: str) -> str:
+    """Normalize scheme-relative and path-relative URLs."""
+    cleaned = (url or '').strip()
+    if cleaned.startswith('//'):
+        return f'https:{cleaned}'
+    if cleaned.startswith('/'):
+        return f'https://www.momoshop.com.tw{cleaned}'
+    return cleaned
+
+
+def is_valid_momo_product_url(url: str) -> bool:
+    """Return whether URL looks like a valid MOMO product page."""
+    if not url:
+        return False
+
+    parsed = urlparse(url)
+    if parsed.scheme not in ('http', 'https'):
+        return False
+    if (parsed.hostname or '').lower() not in MOMO_BASE_DOMAINS:
+        return False
+
+    path = (parsed.path or '').lower()
+    if ERR404_PATH in path:
+        return False
+
+    # 商品頁通常會有 GoodsDetail.jsp 或 goodsDetail/xxx
+    if 'goodsdetail' in path:
+        if 'i_code' not in parse_qs(parsed.query or '') and not re.search(r'/goodsdetail/[^/]+', path):
+            return False
+        query = parse_qs(parsed.query or '')
+        if 'i_code' in query:
+            return True
+        # /goodsDetail/<i_code> 不一定有 query
+        return bool(re.search(r'/goodsdetail/[^/]+', path))
+
+    return False
+
+
+def normalize_momo_product_url(url: Optional[object], i_code: Optional[object]) -> Optional[str]:
+    """
+    Normalize a MOMO URL and fall back to i_code product detail URL when invalid.
+
+    Args:
+        url: Original link.
+        i_code: Product code for fallback URL.
+    """
+    fallback_code = extract_momo_i_code(url) or (str(i_code).strip() if is_probable_momo_icode(i_code) else None)
+    fallback = build_momo_product_url(fallback_code)
+
+    if not url:
+        return fallback
+
+    normalized = _normalize_quoted_url(str(url).strip())
+    if not normalized:
+        return fallback
+
+    lower = normalized.lower()
+    if lower.startswith('javascript:') or lower.startswith('void('):
+        return fallback
+
+    if is_valid_momo_product_url(normalized):
+        return normalized
+
+    # 兜底：若網址可解析且 host 仍是 MOMO，但不是預期路徑，仍可視為損壞資料
+    parsed = urlparse(normalized)
+    if parsed.scheme in ('http', 'https'):
+        return fallback
+
+    return fallback