P0101
Mass or Volume Air Flow Circuit Range/Performance
What it means
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?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
MAF sensor contaminated (oil, dust)
highOne of the most commonly reported causes for this code — check this first.
Unmetered air leak after MAF
mediumA plausible cause — test and verify before replacing parts.
Air filter heavily clogged
mediumA plausible cause — test and verify before replacing parts.
Wiring/connector fault to MAF
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0101 freeNo credit card required