Symptoms of P0101 OBD II Trouble Code
- Malfunction indicator lamp (MIL) illumination (a.k.a. check engine light)
- Rough running engine
- Black smoke from tail pipe
- Stalling
- Engine hard start or stalling after it starts
- Possible other driveability symptoms
Common Causes of P0101 OBD II Trouble Code
- Dirty or contaminated mass air flow sensor
- Failed MAF sensor
- Intake air leaks
- MAF sensor electrical harness or wiring problem (open, shorted, frayed, poor connection, etc.)
- Clogged catalytic converter on some models (GMC/Chevrolet mainly)