Engine and gearbox (P)
P0102: Mass airflow sensor low input
The mass airflow (MAF) sensor is reporting a signal that is lower than expected. This can affect the engine's air-fuel mixture.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Poor fuel economy
- Rough idle
- Engine hesitation
- Reduced power
Common causes
- Sensor failure
- Open circuit
- Restricted intake
How to check it yourself
- Inspect the air filter for blockages
- Check the MAF sensor connector for damage
- Test the MAF sensor voltage and signal
- Inspect the intake system for leaks or restrictions
Can I keep driving?
The car can usually be driven, but performance may be reduced.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer