P0101 Mass or Volume Air Flow Circuit Range/Performance Problem
What does P0101 mean?
P0101 — Mass or Volume Air Flow Circuit Range/Performance Problem. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects mass or volume air flow circuit range/performance problem. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0101
- Dirty or contaminated mass air flow (MAF) sensor
- Clogged or leaking air intake duct between filter and sensor
- Vacuum leak downstream of the MAF sensor
- Damaged MAF sensor wiring or connector
- Faulty mass air flow sensor or PCM
How to fix P0101
- Inspect and clean the MAF sensor with MAF-specific cleaner
- Check the air intake duct for cracks, leaks, and loose clamps
- Visually inspect MAF sensor wiring and connector for damage
- Monitor MAF grams-per-second readings with an OBD-II scanner at idle and 2500 rpm
- Replace the MAF sensor if readings are out of spec after cleaning