OBD-II code guide
P0100 Mass or Volume Air Flow Circuit
P0100 means the mass airflow circuit has a general electrical or signal fault.
What it means
The engine computer cannot reliably use airflow information for fueling calculations.
Common symptoms
- Hesitation
- Rough idle
- Poor fuel economy
- Stalling
- Check engine light
Likely causes
- Dirty or failed MAF sensor
- Loose intake duct
- Wiring issue
- Connector corrosion
- Air leak after the sensor
First checks
- Inspect the intake boot after the air filter.
- Check MAF connector fit.
- Look for other lean or rich codes.
- Avoid spraying harsh cleaners on the sensor.