diff --git a/consent-tester/services/cmp_extractor.py b/consent-tester/services/cmp_extractor.py
index 7f8ef0ad..5030ff4f 100644
--- a/consent-tester/services/cmp_extractor.py
+++ b/consent-tester/services/cmp_extractor.py
@@ -80,21 +80,33 @@ class CMPCapture:
             data = await _parse_json_response(response)
             if data is None:
                 return
-            # Skip tiny payloads — real CMP cookie policies are ≥5KB.
-            # A 4KB JSON of cookie-shaped data is almost never the policy.
             try:
                 size_kb = len(json.dumps(data)) // 1024
             except Exception:
                 size_kb = 0
-            if size_kb < 5:
-                return
             from services.cmp_heuristic import looks_like_cookie_policy
-            if looks_like_cookie_policy(data):
+            matched = looks_like_cookie_policy(data)
+            if matched and size_kb >= 5:
                 self.payloads.append(("_heuristic", data))
                 logger.info(
                     "CMP captured: _heuristic (%s, ~%dKB)",
                     url[:120], size_kb,
                 )
+            elif size_kb >= 3:
+                # Phase-0-Diagnose-Log: JSON-Response die als CMP-Kandidat
+                # ueberlebt hat, aber heuristic OR size-threshold abgelehnt
+                # wurde. Zeigt beim naechsten VW/BMW/... Run welche Endpoints
+                # uebersehen werden — schneller Pattern-Add ohne raten.
+                top_keys = []
+                if isinstance(data, dict):
+                    top_keys = list(data.keys())[:8]
+                elif isinstance(data, list) and data and isinstance(data[0], dict):
+                    top_keys = list(data[0].keys())[:8]
+                logger.info(
+                    "CMP candidate skipped: url=%s size=%dKB heuristic=%s "
+                    "top_keys=%s",
+                    url[:120], size_kb, matched, top_keys,
+                )
         except Exception as e:
             logger.debug("CMP listener error: %s", e)