OBD-II code · Powertrain (generic)
P0100 Mass or Volume Air Flow Circuit Malfunction
The ECU detects a general electrical malfunction in the mass air flow (MAF) sensor circuit. The signal is missing, out of plausible range, or the wiring shows continuity issues. Used as a generic fault when no more specific MAF code applies.
Is it safe to drive with P0100?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyMAF sensor element contaminated (oil, dust)
- PossibleMAF wiring or connector damaged
- PossibleMass air flow sensor failed
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, Maf Wiring, Maf Connector, Intake Duct
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.