Throttle position sensor problems

Asked by Mar 12, 2013 at 08:09 PM about the 2003 Mercedes-Benz C-Class C 240 Sedan

Question type: Maintenance & Repair

2003 mercedes c240 owner here, I'm  receiving the error code P0123 for the throttle position sensor. Symptoms are
little to no acceleration periodically, and the problem vanishes with a restart of the engine. And I'm now looking for
possible solutions; should the entire accelerator pedal assembly be replaced or just the sensor? Thanks
Also if you have instructions on pedal removal that would be helpful.

2 Answers

102,305

If you replace anything, just replace the sensor. If the sensor was bad, wouldn't it be bad all the time? Maybe it's something else.

2 of 2 people found this helpful.
102,305

Possible causes - Faulty throttle position sensor - Throttle position sensor harness is open or shorted - Throttle position sensor circuit poor electrical connection --- The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM. Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

6 of 6 people found this helpful.
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