P0108 on a Lexus: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Safe to drive, but the engine may idle rough and use more fuel until the sensor issue is fixed.

What P0108 means on a Lexus

On a Lexus, P0108 means the manifold absolute pressure (MAP) sensor is sending a higher-than-expected voltage. Lexus engines use MAP sensors on many models to help the computer judge engine load, working alongside the MAF sensor. A failed sensor or wiring short can cause rough idle and worse fuel economy.

Is P0108 common on Lexuss?

P0108 is less common on Lexus than on some brands, but it does appear on models like the ES, RX, and GX as they age, usually from a failing sensor or corroded connector. Lexus MAP sensor parts cost more than generic-brand parts, but the repair itself is straightforward.

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

Symptoms

Check engine light on
Rough idle
Hesitation when accelerating
Reduced fuel economy

Common causes

most common: Faulty MAP sensor
common: Signal wire shorted toward 5 volts
common: Corroded or loose connector terminals
less common: Damaged wiring near the intake manifold

How to fix it

Fix	DIY?	Typical cost
Replace the MAP sensor	Yes	$60–140
Repair the wiring or connector	Mechanic	$60–160
Have a shop replace the sensor and verify the circuit	Mechanic	$170–320

Frequently asked questions

Can I drive my Lexus with a P0108 code?

Yes. It is a sensor fault, but rough running and extra fuel use mean you should fix it soon.

Why does P0108 happen on Lexus models?

Because the MAP sensor fails or the connector corrodes over time. It is less common on Lexus than on some brands, but the causes are the same sensor-circuit faults.

How much does a Lexus P0108 repair cost?

A MAP sensor part runs about $60–$140. With shop labor and testing, expect $170–$320.