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.
Stop driving if: the check engine light is flashing, or the car starts running noticeably worse
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?
Listed in the order most shops would check them — cheapest and most likely first, not as statistical odds. The real cause varies by year, make, model and engine.
- Wiring issueCheck 1st
- Unmetered air leak after the MAFCheck 2nd
- Loose or damaged MAF connectorCheck 3rd
- Faulty MAF sensorCheck last
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):
Costs vary a lot by vehicle and region. These are typical US ranges including parts and labor — treat them as a ballpark for the conversation with your shop, not a quote.
| MAF sensor cleaner | – |
| MAF sensor (replacement) | – 0 |
| Intake hose | – 0 |
Tools & parts that help
A can of MAF cleaner fixes P0102 surprisingly often. Pair it with a scanner to clear the code and confirm the fix.
See top-rated OBD-II scanners ›As an Amazon Associate I earn from qualifying purchases. This costs you nothing extra and never changes what we recommend.
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?
– if cleaning works, or -0 for a new sensor.
Related codes
General guidance based on the standard SAE definition of the P0102 code. A real diagnosis depends on your make, model, year, engine and other symptoms. This is not a substitute for a professional inspection — when in doubt, have a technician confirm the cause before replacing expensive parts.