Mass or Volume Air Flow Circuit Range/Performance
The mass air flow (MAF) sensor signal is outside the expected range or does not track engine load plausibly. The ECU compares MAF readings against load calculated from RPM, throttle position and intake pressure; persistent disagreement triggers this code.
Affected components
- Mass air flow sensor
- Air filter
- Intake duct
- Intake manifold
Common causes
- High likelihood: MAF sensor contaminated (oil, dust)
- Medium likelihood: Unmetered air leak after MAF
- Medium likelihood: Air filter heavily clogged
- Low likelihood: Wiring/connector fault to MAF
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.