P0102 — Mass Air Flow (MAF) Circuit Low Input
Drive with caution — fix soon.
What P0102 means
This code is set when the MAF sensor signal is lower than the car's computer expects. That low reading tells the engine very little air is coming in, so it adds less fuel and the engine can run lean. The cause is often a wiring fault, a leak, or a sensor that isn't reading correctly.
Common symptoms
- Check Engine light is on
- Loss of power, especially when accelerating
- Hard starting or stalling
- Rough idle
- Poor fuel economy
Common causes
- Faulty or failing MAF sensor
- Open or shorted wiring in the MAF circuit
- Corroded or loose MAF connector
- Vacuum or intake leak fooling the sensor
- Dirty MAF sensor element
- Blocked or restricted air intake
Typical repair cost
$90 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I drive with a P0102 code?
Usually for short distances, but the engine may stall or feel gutless. Have it checked promptly, especially if it stalls at stops, since that can be unsafe in traffic.
How much does it cost to fix P0102?
Typically $90 to $400. A wiring repair or sensor cleaning is on the lower end, while a new MAF sensor and labor push it higher.
Is P0102 serious?
It's a moderate concern. It rarely leaves you stranded, but running lean over time isn't good for the engine, so it shouldn't be ignored.
Why is my MAF reading low?
Common reasons are a dirty or failing sensor, broken wiring, or a loose connector. A leak in the intake after the sensor can also make the signal read low.