Why does the RPM goes up and down when the car is parking? Mercedes C 200, 2005
model? Once or twice a week a warning appeared saying ( light sensor drive to workshop) and when the car is idle, the RPM goes up and down , I have got the car checked by computer and they gave different answers and some said there is air leak and the other said air control valve is blocked but nobody was able to diagnose the problem correctly, would any body help me what the malfuction is.
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