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

96,905

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 out of 2 people think this is helpful.
96,905

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 out of 6 people think this is helpful.
Best Answer

Your Answer

Add photo

Related Questions

Search Mercedes-Benz C-Class Questions

Mercedes-Benz C-Class Experts

#1 Lorne Grandison
Lorne Grandison
Reputation 4,770
#2 PPC123
PPC123
Reputation 3,320
#3 dandyoun
dandyoun
Reputation 2,420
View All

Related Models For Sale

Used Mercedes-Benz E-Class
343 Great Deals out of 19,934 listings starting at $699
Used BMW 3 Series
1,026 Great Deals out of 31,905 listings starting at $1,000
Used Mercedes-Benz S-Class
161 Great Deals out of 6,524 listings starting at $1,000
Used BMW 5 Series
472 Great Deals out of 15,900 listings starting at $1,700
Used Audi A4
219 Great Deals out of 10,811 listings starting at $1,500
Used BMW M3
40 Great Deals out of 1,543 listings starting at $5,800
Used Mercedes-Benz CL-Class
23 Great Deals out of 589 listings starting at $3,980
Used Ford Mustang
452 Great Deals out of 45,664 listings starting at $1,999
Used Mercedes-Benz M-Class
163 Great Deals out of 5,196 listings starting at $1,990
Used Chevrolet Camaro
205 Great Deals out of 30,800 listings starting at $1,217
Used Honda Accord
809 Great Deals out of 85,771 listings starting at $988
Used Mercedes-Benz CLK-Class
39 Great Deals out of 1,253 listings starting at $1,500

Used Cars For Sale

2017 Mercedes-Benz C-Class For Sale
24 Great Deals out of 13,028 listings starting at $31,950
2016 Mercedes-Benz C-Class For Sale
53 Great Deals out of 1,990 listings starting at $24,900
2015 Mercedes-Benz C-Class For Sale
51 Great Deals out of 1,273 listings starting at $20,915
2014 Mercedes-Benz C-Class For Sale
62 Great Deals out of 2,392 listings starting at $13,980
2013 Mercedes-Benz C-Class For Sale
70 Great Deals out of 1,722 listings starting at $12,190

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.