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Thanks, XXXXX XXXXX clarify..is this a 300D or a 300E?
Thanks, XXXXX XXXXX Diesel model the P0120 code is not for the throtle position or the accelerator pedal position...it pertains to the Pressure Control Flap Transducer...see the definitions below...
Below is an illustration of the EGR system transducers...most likely one of them is faulty or the vacuum hoses to them...but this system can ONLY be correctly diagnosed with a Mercedes level scan tool.