OBD-II Code · Emissions
P0457
EVAP Leak Detected — Fuel Cap Loose/Off
low severitySafe to drive$0-$40
EVAP leak specifically attributed to loose fuel cap.
Common symptoms
- CEL
- Gas cap warning light
Likely causes
- Loose cap
- Worn cap seal
Where to start
- Try the cheapest cause first. Start by checking: loose cap.
- Cost & scope. $0-$40
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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