Engine starts, idles but will not rev. - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 03-02-2012, 11:32 PM Thread Starter
BenzWorld Junior Member
Date registered: Sep 2011
Vehicle: 2001 clk430
Location: Sydney Australia
Posts: 7
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Engine starts, idles but will not rev.

HI, i have 2001 clk430 and it is as though the accelerator is not conected, the car just idles with no pedal at all.(engine check light is on) I scanned the car with my OBD2 scanner and got a PO121 code (throttle/pedal sensor/switch circuit A problem). I bought a second hand sensor (Part number A012542) and plugged it in with no change. Do i have to do a reset before the new sensor will work? or is it another problem entirely? Does any one know of a way to test the sensor as the pins are numbered in the plug housing? Any advise welcomed.
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