Throttle Position Sensor.

[Dichtung]

Morning Guys. W203 facelift, OM646 engine. EML light on and diagnosis reads " P0123 throttle position sensor `A`circuit high."
Anybody have experience of this? Where is this sensor? On the intake manifold? Near the pedal? Any pointers appreciated. Thanks for reading.

 

[Petrol Pete]

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

This perhaps ? not tried it myself . But worth a go.

It could be the accelerator pedal position reading wrong. This can be read live by any decent scan tool.

p0123 mercedes-benz Code - Throttle/Petal Position Sensor/Switch 'A' Circuit High Input

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the throttle control system. The driver demand is sensed

www.autocodes.com

 

[BaldGuy]

A very common problem on the R230 SL too - a replacement pedal assembly is needed - i'd guess probably the same for the W203

 

[Dichtung]

Thanks Petrol Pete. Tried it - no change

Thanks BaldGuy, looking like I`ll try swapping the pedal assy..

 

[Petrol Pete]

Don't replace it until you read the live data from it . You gave us a code in your first post, does your code reader not have the facility to read live data ? It might save you a few quid .

https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwj5h4X6_c_5AhXlgVAGHT86DIUYABAJGgJkZw&ae=2&ohost=www.google.com&cid=CAASJuRoLjLvEhNjI9Q2rVQL0cgUUiKLglaTveRnNW-3yaq5SuMAHud9&sig=AOD64_1pH-DoKZxn4wluvKkaT2Tu6f4EuQ&ctype=5&q=&ved=2ahUKEwjloP75_c_5AhUVEcAKHbnqC_sQ9aACKAB6BQgBEIsB&adurl=

 

[zipdip]

Well maybe remove the negative battery terminal for 20 mins.

 

[Dichtung]

Righty P Pete. No, my diagnosis tool will not do live data. Found a guy that may sort it next week.

 

[Dichtung]

Update Guys. Still not had live data read. (Technician snowed under and now on holiday) But my reader seems to have abandoned `throttle position ` fault, and consistently brings up P0244 - turbo wastegate actuator solenoid A range, and Mercedes specific P1402 -exhaust back pressure.
I presume one fault triggers the other but which triggers which ?
Luckily, the car starts and drives normally, so is used daily.
Any pointers please.