P0108 on a Toyota: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

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

What P0108 means on a Toyota

On a Toyota, P0108 means the manifold absolute pressure (MAP) sensor is sending a higher voltage than the computer expects. Toyota uses MAP sensors on several engines, including some four-cylinder and V6 models, where the signal works alongside the MAF sensor to judge engine load. A bad reading can cause rough idle, hesitation, and worse fuel economy.

Is P0108 common on Toyotas?

P0108 shows up on higher-mileage Toyotas like the Camry, Corolla, and RAV4, usually when the MAP sensor fails or the connector terminals corrode. It is a sensor-circuit fault, not a mechanical engine problem, so the repair is usually quick once the wiring checks out.

Commonly reported on: Camry, Corolla, RAV4, Highlander.

Symptoms

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

Common causes

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

How to fix it

Fix	DIY?	Typical cost
Replace the MAP sensor	Yes	$40–110
Repair the sensor wiring or connector	Mechanic	$50–150
Have a shop replace the sensor and verify the circuit	Mechanic	$120–250