P0455low severityPowertrain
EVAP System Leak Detected (Gross Leak)
on 2005-2011 Audi A6 4.2L V8 · AWD
What this code means
A large leak has been detected in the EVAP system.
Symptoms
- Check Engine Light
- Fuel smell
- Failed emissions
Common causes
- Gas cap missing or very loose
- Disconnected EVAP hose
- Cracked charcoal canister
- Large hose crack
- Fuel filler neck crack
Diagnostic steps
- Check gas cap - may be missing or damaged
- Visually inspect all EVAP hoses
- Smoke test EVAP system
- Check charcoal canister
- Inspect fuel filler neck
Repair notes
Large leaks are usually easy to find. Check gas cap first.
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