P0102 on a Lexus: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

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

What P0102 means on a Lexus

On a Lexus, 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 the fuel mixture goes off and the engine may idle rough, hesitate, or stall.

Is P0102 common on Lexuss?

P0102 shows up on Lexus models with higher mileage, often the RX, ES, IS, and GX. Because Lexus shares Toyota engine designs, the usual story is the same: the MAF sensor wire gets contaminated over time, often by oil vapors from the PCV system. A dirty air filter or a loose intake tube clamp can also cause a low reading.

Commonly reported on: RX, ES, IS, GX.

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	$20–60
Repair the MAF sensor connector or wiring	Mechanic	$100–250
Replace the MAF sensor	Yes	$120–320