Mass or Volume Air Flow Circuit Malfunction
Our emissions expert has put together the following information about the P0100 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
- OBD II P0100
Fault Code Definition
The Mass Airflow Sensor (MAF) measures the amount of air entering the engine and the Engine Control Module (ECM) uses the information to determine the proper amount of fuel quantity and ignition timing. The P0100 trouble code is set when the ECM detects a problem in the electrical circuit between the ECM and the MAF Sensor.
Symptoms
- Check Engine Light will illuminate
- Engine runs poorly
- Poor fuel mileage
- In some cases, no abnormal symptoms may be noticed
Common Problems That Trigger the P0100 Code
- The MAF Sensor is unplugged or the wiring is damaged
- Loose or corroded electrical terminals in the MAF Sensor circuit
- Faulty MAF Sensor
Common Misdiagnosis
- MAF Sensor replaced when the connector and/or wiring is bad
