MAF circuit low input
What P0102 means
Your car's computer set P0102: MAF circuit low input. It belongs to the fuel and air metering group of codes. It is a generic code, so it means the same thing on every make. The check engine light usually comes on once the fault has been seen on two drives in a row. Until then it shows up as a pending code.
Can I keep driving? Usually safe to drive for now, but get it checked soon. Left alone it can lower fuel economy, fail an emissions test or lead to a bigger repair.
Common causes
- Dirty MAF sensor (often fixed with MAF cleaner)
- Air leak between the MAF and the throttle body
- Damaged wiring or connector
- Failed MAF sensor
Fix the cheapest, most likely cause first. Clearing the code without a repair only turns the light off until the fault comes back.
Check it yourself
Graph MAF at idle and while revving. Readings that jump around or stay flat while RPM rises point to the sensor.
Torque Deck reads P0102 with a cheap Bluetooth OBD2 adapter. It also shows the freeze frame (engine conditions at the moment the code set) and the live data you need to narrow it down.
Parts
Parts most often replaced for P0102: mass air flow sensor. Confirm the cause first, and match the part to your exact engine.
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Related codes
This page explains what the code usually means. It is not a diagnosis of your car. When in doubt, ask a mechanic.