Manifold Absolute Pressure / Mass Air Flow - Throttle Position Correlation at Higher Load
At higher load, the relationship between MAP/MAF and throttle position does not match the calibrated map — typically a charge-air leak, restricted intake, or wide-open MAF underread.
Affected components
- Manifold absolute pressure sensor
- Mass air flow sensor
- Charge air pipe
- Intake air filter
Common causes
- High likelihood: Charge-air pipe leak after turbo
- Medium likelihood: MAF sensor contaminated
- Low likelihood: Air filter heavily restricted
Possible symptoms
- Check engine light on
- Power loss, hesitation under acceleration
- Rough or unstable idle
- Increased fuel consumption
- Possible difficulty starting
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.