P0103 Mass or Volume Air Flow Circuit High Input
The MAF signal is higher than expected.
Common causes
- Shorted signal circuit
- Faulty MAF sensor
- Wiring routed near ignition components
Symptoms
- Check engine light
- Rich running
- Black smoke on diesels
What to check
- Check wiring for chafing
- Measure signal with engine off and running
- Try a known-good sensor
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0103, follow the service information for that make and model.
Related codes
- P0100 Mass or Volume Air Flow Circuit
- P0101 Mass or Volume Air Flow Circuit Range/Performance
- P0102 Mass or Volume Air Flow Circuit Low Input
- P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance
- P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
- P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input