Evaporative Emission System Leak Detected (Small Leak)
A small leak (typically equivalent to a 0.040 inch / 1.0 mm orifice) has been detected in the EVAP system. By far the most common cause is a fuel cap that is loose, missing, or has a worn seal.
Affected components
- Fuel filler cap
- Evap canister
- Evap purge valve
Common causes
- High likelihood: Fuel cap loose, missing, or worn seal
- Medium likelihood: Small crack in EVAP hose
- Low likelihood: Purge valve leaking
Possible symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.