P0102 on a Mazda: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Usually drivable, but a bad MAF signal can cause rough idling or stalling, so get it checked soon.

What P0102 means on a Mazda

On a Mazda, P0102 means the mass air flow (MAF) sensor is sending a signal lower than the engine computer expects. The computer can't tell how much air is entering, so it gets the fuel mixture wrong and the engine may idle rough, hesitate, or stall.

Is P0102 common on Mazdas?

P0102 shows up on Mazdas with higher mileage, especially the older 2.0L and 2.3L MZR engines in the Mazda3 and Mazda6 and the Skyactiv engines in newer Mazdas. A contaminated MAF sensor wire is the usual cause, often from a dirty air filter or oil vapors from the PCV system coating the sensor. Cracks in the intake hose can also play a part.

Commonly reported on: Mazda3, Mazda6, CX-5, MX-5.

Symptoms

Check engine light is on
Rough idle or stalling
Hesitation when accelerating
Poor fuel economy

Common causes

most common: Dirty or contaminated MAF sensor
common: Loose or corroded MAF sensor connector or wiring
common: Clogged air filter restricting airflow
less common: Faulty MAF sensor that needs replacement

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with MAF cleaner spray	Yes	$10–20
Replace the air filter	Yes	$15–40
Repair the MAF sensor connector or wiring	Mechanic	$100–250
Replace the MAF sensor	Yes	$80–300