Engine and gearbox (P)
P0101: Mass airflow sensor range issue
The mass airflow (MAF) sensor is detecting airflow that does not match expected values. This can affect engine performance and fuel efficiency.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Check engine light on
- Poor fuel economy
- Rough idle
- Hesitation or stalling
Common causes
- Contaminated MAF sensor
- Intake leak
- Restricted air filter
- Faulty MAF sensor
- Wiring issues
How to check it yourself
- Inspect and clean the MAF sensor
- Check for intake leaks
- Inspect and replace the air filter if needed
- Examine MAF sensor wiring and connections
Can I keep driving?
The car can usually be driven, but performance may be affected.
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