BMW Error Code P1120: How to Fix It

Q: Can I still drive my BMW with error code P1120?

You should avoid driving except to get to a repair facility. P1120 can cause unpredictable acceleration, poor engine performance, or trigger limp mode, making the vehicle unsafe to operate normally.

Q: How much does it cost to fix BMW error code P1120?

DIY repair costs $150-400 for a replacement pedal assembly. Professional repair typically costs $400-800 including parts, labor, and diagnostic time, depending on your BMW model and local labor rates.

Q: What causes BMW pedal position sensor to fail?

Common causes include normal wear after high mileage, moisture intrusion, electrical connector corrosion, wiring damage from rodents, or voltage fluctuations from a failing alternator or weak battery.

Q: How do I know if my BMW pedal position sensor is bad?

Symptoms include P1120 error code, poor acceleration response, engine hesitation, rough idle, unexpected RPM changes, or the vehicle entering limp mode with reduced power output.

Q: Will disconnecting the battery reset BMW error code P1120?

Disconnecting the battery will temporarily clear the code from memory, but P1120 will return immediately if the underlying pedal position sensor problem isn't fixed. The issue must be properly diagnosed and repaired.

Abstract

BMW error code P1120 indicates a malfunction in the accelerator pedal position sensor potentiometer 1. This critical sensor tells the engine control module how much throttle you're requesting, and when it fails, your vehicle may experience poor acceleration, rough idling, or even enter limp mode for safety.