OBD-II code · Powertrain (generic)
P0101 Mass or Volume Air Flow Circuit Range/Performance
The mass air flow (MAF) sensor signal is outside the expected range or does not track engine load plausibly. The ECU compares MAF readings against load calculated from RPM, throttle position and intake pressure; persistent disagreement triggers this code.
Is it safe to drive with P0101?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyMAF sensor contaminated (oil, dust)
- PossibleUnmetered air leak after MAF
- PossibleAir filter heavily clogged
- Less likelyWiring/connector fault to MAF
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Mass Air Flow Sensor, Air Filter, Intake Duct, Intake Manifold
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.