EVAP System Leak Detection Reference Orifice Low Flow
During the EVAP leak-detection self-test, the calibration airflow through the reference orifice is below the expected rate. The orifice may be partially blocked.
Affected components
- Evap leak detection pump
- Evap canister
Common causes
- High likelihood: Reference orifice partially blocked
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
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.