P0456 – EVAP System Very Small Leak Detected
Description
A very small leak has been detected in the EVAP system.
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Compare Diagnostic ScannersSymptoms
- Check engine light
- Fuel smell
- Slight rough idle
- Failed emissions test
- Reduced fuel efficiency
Causes
- Loose gas cap
- Cracked EVAP hose
- Faulty purge valve
- Faulty vent valve
- Leaking charcoal canister
Diagnosis
- Smoke test EVAP system
- Inspect hoses
- Test purge valve
- Test vent valve
- Check gas cap seal
Repair
- Tighten or replace gas cap
- Replace cracked hoses
- Replace purge valve
- Replace vent valve
- Replace charcoal canister
