Mass Air Flow Sensor Circuit Low Input
The engine computer is getting a weak signal from the mass air flow sensor. This usually happens when the sensor is unplugged, the wiring or connector is damaged, or the sensor has failed.
You can usually drive short distances, but the engine may run poorly, stall, or have reduced power. Fix it soon to avoid drivability problems and possible fuel economy issues.
P0102 means the powertrain control module has detected a mass air flow sensor signal voltage or frequency that is lower than the expected operating range. The MAF sensor measures incoming air so the PCM can calculate fuel delivery. When the signal is too low, the PCM may switch to backup values and turn on the check engine light.
Yes. An unplugged sensor is a very common cause, and a sensor with electrical problems can also trigger a low input code.
Yes. The engine may idle roughly, hesitate, stall, or feel weak because fuel delivery is based on incorrect airflow information.
Not before checking the connector and wiring. A loose plug, damaged wires, or corroded terminals are common and can cause the same code.