Originally Posted by
Ray S.
Sorry its a 05 roadster auto with 82,000 miles and went out yesterday with it and my check engine lite came on this time stopped at auto zone code was p0121 so is it the pedal sensor or the throttle position sensor I got to get a code reader just don't know witch one to get yet.
I read a post and apparently the correct Mercedes-Benz part number is: 170-300-01-04.
The cheapest one I found is here: (You may have to grab a VIN from an SLK 320 for sale online to check out).
https://www.mbdirectparts.com/oem-pa...dal-1703000104