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P0457: Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
Severity: Low Usually safe to keep driving, but get it checked.
What does P0457 mean?
The computer has detected an EVAP leak and suspects the fuel cap.
Generic OBD-II definition: Evaporative Emission System Leak Detected (Fuel Cap Loose/Off). Confirm applicability in your vehicle service information.
Common causes
- Loose or missing gas cap
- Worn cap seal
- Damaged filler neck
Symptoms
- Usually no drivability symptoms
- Possible faint fuel smell
- Will likely fail an emissions inspection
Can I keep driving with P0457?
Severity: Low Usually safe to keep driving, but get it checked.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Tighten the cap until it clicks
- Replace the cap if the seal is worn
- Clear code and recheck