Make sure your throttle cable is properly adjusted/tightened. My old C200 would not kick down (i have posted about this about 6 months ago) and I thought maybe the switch was broken. Turns out the throttle cable was loose and so even with the accelerator fully depressed I was not getting a wide open throttle.
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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190
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