2001 Mercedes S500 (Code PO120) Accelerator Pedal Sensor
Aron’s question:
“My 2001 Mercedes S500 is running poorly. The check engine light came on, and the code stored is PO120, something about the accelerator sensor. Have you seen this before?”
Answer:
That’s the code for Accelerator Pedal Sensor problem. The last one I fixed was repaired by replacing the pedal sensor, which comes as a complete pedal assembly only from Mercedes. It’s rather like a computer mouse that tells the vehicle’s computer how much acceleration you need for how far you’ve pushed the accelerator pedal down. They don’t use accelerator pedals anymore to open the engine throttle, they use computer sensors and electrical motors to move the throttle instead.
