CarSense › Trouble codes › P0102

P0102: Mass or Volume Air Flow Circuit Low Input

What this check-engine code means in plain English, what usually causes it, and what a fix typically costs.

Severity: Monitor — affects performance and fuel economy, address soon

What P0102 means

The Mass Air Flow (MAF) sensor measures how much air enters the engine so the computer can adjust fuel delivery. This code means the MAF sensor is reporting an airflow signal that is lower than expected for current operating conditions, which can cause poor performance, rough idling, and reduced fuel economy.

What causes P0102?

Likely
Dirty or contaminated MAF sensorOil, dirt, or debris on the sensor element disrupts accurate airflow measurement.
Likely
Air leak after the MAF sensorUnmetered air entering through cracks in intake tubing or loose clamps causes incorrect readings.
Possible
Failed MAF sensorThe sensor itself has electrically failed and needs replacement.
Possible
Wiring or connector issuesDamaged wires, corroded pins, or loose connections in the MAF sensor circuit cause low voltage signals.

Is P0102 safe to drive?

Drive it?
Usually yes, short-term
Watch for
Hesitation, stalling, black smoke, or poor acceleration
DIY-friendly?
Cleaning the MAF sensor is straightforward; diagnosis requires care

You can typically continue driving with this code, but expect reduced performance, hesitation, and worse fuel economy. The engine may run rough or stall at idle. Address it within a few days to prevent potential damage from incorrect fuel mixture over time.

P0102 repair cost

~$50 – $400+

Industry-average estimates. Cost depends on whether cleaning the sensor resolves it (minimal cost) versus needing a new MAF sensor or repairing intake leaks.

Which one is it for your car?

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