P0440low severityPowertrain
Evaporative Emission Control System Malfunction
on 2008 Audi R8 4.2L V8 · AWD
What this code means
General EVAP system malfunction. The EVAP system captures fuel vapors and prevents them from escaping to the atmosphere.
Symptoms
- Check Engine Light
- Fuel smell
- Failed emissions test
Common causes
- Loose or missing gas cap (most common)
- Cracked EVAP hose
- Faulty purge valve
- Faulty vent valve
- Charcoal canister saturated
- Leak in fuel tank or filler neck
Diagnostic steps
- Check gas cap seal and tighten
- Perform EVAP smoke test
- Test purge valve
- Test vent valve
- Check EVAP hoses
- Inspect charcoal canister
Repair notes
Start with gas cap - tighten and clear code. If returns, smoke test the EVAP system.
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