P0102
Moderate severityMass Air Flow (MAF) Sensor Circuit Low Input
Drivable, but the engine may run rough, hesitate or have worse fuel economy. The MAF sensor tells the computer how much air is entering the engine; bad readings mean bad fueling decisions.
What does the P0102 code mean?
The P0102 code means the Mass Air Flow (MAF) sensor is sending a signal that’s too low — typically below the expected voltage range. The MAF measures how much air is entering the engine, which the computer uses to calculate fuel delivery.
When the signal is too low, the computer doesn’t know how much fuel to add. The most common cause is a dirty MAF sensor or a loose connector. See also the related P0101.
Can you keep driving with a P0102 code?
Yes, with care. The car may stall, hesitate, idle rough or surge. Drive only as far as needed to diagnose it; serious driveability issues mean you should fix it sooner rather than later.
What causes a P0102 code?
- Dirty MAF sensor~40%
- Faulty MAF sensor~25%
- Loose or damaged MAF connector~20%
- Unmetered air leak after the MAF~10%
- Wiring issue~5%
How to diagnose a P0102 (check these first)
- Unplug, inspect and reseat the MAF connector firmly.
- Clean the MAF sensor with MAF-safe cleaner — never touch the sensor wire.
- Look for cracks or loose clamps in the intake hose between the MAF and the engine.
- Replace the MAF sensor if cleaning doesn’t fix it.
P0102 repair cost
Typical US ranges including parts and labor (varies by vehicle):
| MAF sensor cleaner | $10 – $20 |
| MAF sensor (replacement) | $80 – $300 |
| Intake hose | $30 – $100 |
Tools & parts that help
A $10 can of MAF cleaner fixes P0102 surprisingly often. Pair it with a $20 scanner to clear the code and confirm the fix.
See MAF cleaners & OBD-II scanners ›P0102 — Frequently asked questions
Is it safe to drive with a P0102 code?
Short-term yes, but the car may run rough or hesitate. Fix it soon – bad MAF data hurts fuel economy and performance.
Can a dirty MAF sensor cause P0102?
Yes – it’s the most common cause. Clean it with MAF-safe cleaner before replacing anything.
How do I clean a MAF sensor?
Spray MAF-safe cleaner on the sensor element (never touch the wire). Let it dry completely before reinstalling.
How much to fix P0102?
$10-$20 if cleaning works, or $80-$300 for a new sensor.
Related codes
General guidance based on the standard definition of the P0102 code. A real diagnosis depends on your make, model, mileage and other symptoms. When in doubt, have a professional confirm the cause before replacing expensive parts.