P1120 Accelerator pedal position sensor: circuit fault
P1120 means: Accelerator pedal position sensor: circuit fault. There are usually two throttle or accelerator pedal position sensors and they must agree. Drive gently and have the car checked soon. The most common repair costs about €90–180 in Estonia, depending on make and model. The most common cause: dirty throttle body or worn sensor.
What it means
There are usually two throttle or accelerator pedal position sensors and they must agree. The computer found a wrong signal or the two don't match.
This is a make-specific code (Toyota). The exact meaning can vary by model and year.
What you may notice
- Engine light on
- Limp mode with no power
- Throttle response is delayed
- Idle hunts
What could be wrong
- 1Dirty throttle body or worn sensor · Throttle body clean or replace €90–180
- 2Worn accelerator pedal sensor · Accelerator pedal sensor replacement €120–240
- 3Corroded connector · Wiring or connector repair €45–90
- 4Broken wire · Wiring or connector repair €45–90
Repair difficulty: Moderate
What you can check yourself
Check the throttle body and pedal connectors. Cleaning the throttle body often helps. You can check the simple things yourself, but the repair is best done in a workshop.
How we fix it
- We read the sensor on the diagnostic tool and compare it with other sensors
- We check the connector, supply and ground
- We repair the wiring or replace the sensor or throttle body
Standard SAE description: Accelerator Pedal Position Sensor Circuit