Powertrain
generic / SAE
P0457
Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
The EVAP system detected a large leak that strongly correlates with a missing or improperly closed fuel filler cap. After re-tightening the cap, the code clears once the readiness monitor completes.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 57
Possible causes
- Fuel cap loose, missing, or worn seal high
- Filler neck damaged low
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 10–80 €
- Estimated time: 0–0.5 h
- Component: fuel filler cap
- Component: evap lines
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012