P0102 Code: Mass Air Flow Sensor Circuit Low

🟠 Moderate severity · drivable

You can usually drive short distances, but expect rough idle, poor acceleration, and possibly stalling.

What P0102 means

The mass air flow (MAF) sensor measures how much air enters the engine so the computer can add the right amount of fuel. This code means the sensor signal is lower than it should be, so the engine does not know how much air is coming in. The engine may run rough, stall, or use more fuel.

Symptoms

Check engine light on
Rough idle or stalling
Poor acceleration
Poor fuel economy
Engine hesitates or runs lean

Common causes

most common: Dirty or contaminated MAF sensor
common: Vacuum leak after the MAF sensor
common: Faulty MAF sensor
less common: Damaged or loose wiring to the MAF sensor
less common: Clogged air filter or intake restriction

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with MAF cleaner	Yes	$10–20
Replace the MAF sensor	Yes	$80–250
Repair vacuum leaks in the intake	Yes	$20–100
Repair or replace the MAF wiring	Yes	$20–80