High Airflow/Vacuum Leak Detected (Slow Accumulation)
Long-term fuel and air adaptation values indicate a slow but continuous excess of air entering the engine. The ECU concludes that an unmetered air leak is gradually growing in the intake system.
Affected components
- Intake manifold gasket
- Vacuum hoses
- Throttle body
- Mass air flow sensor
Common causes
- High likelihood: Cracked vacuum hose or intake gasket
- Medium likelihood: Dirty mass airflow sensor
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.