Complete diagnostic information for error code P0103
Manufacturer-Specific Variations
This code (P0103) may have different meanings or additional parameters depending on your vehicle's make, model, and year. Always verify with your vehicle's service manual or a qualified technician before attempting repairs.
P0103
Powertrain CodeMass Air Flow Sensor Signal too High
Description
Mass Air Flow Sensor (MAF) (G70), Signal too High
Common Symptoms
- Check Engine Light
- Poor engine performance
- Possible rich fuel mixture condition
- Black smoke from exhaust (gasoline engines)
- Reduced fuel economy
- Possible flooding or hard starting
Possible Causes
- Contaminated MAF sensor reading high
- Failed MAF sensor
- Short to power in MAF signal circuit
- Aftermarket air intake modifications
- ECU reference voltage issue
Diagnosis Steps
- Check MAF sensor voltage or frequency readings
- Test for shorts to power in MAF signal circuit
- Inspect MAF sensor for contamination or damage
- Check for aftermarket air intake modifications
- Test ECU reference voltage to MAF
Repair Solutions
- Clean contaminated MAF sensor
- Replace faulty MAF sensor
- Repair shorted MAF signal wiring
- Remove or correct aftermarket intake modifications
- Repair ECU reference voltage circuit
Prevention Tips
- Use OEM or quality replacement air filters
- Avoid oil-coated air filters near MAF sensors
- Professional installation of aftermarket intakes
Working with ECU firmware? Remove DTCs directly from firmware files
Our free Firmware DTC Remover detects and removes hardcoded fault codes directly from ECU firmware files — no software needed. Supports BMW/MINI (EDC16, EDC17, MEVD17) and VAG Group (EDC17). Free: 3 removals/day.