CEL Turns off?
but then today, it turns off!
i didnt know the CEL turns off. Does that mean my car is "okay" now?
With your symptoms, https://mbworld.org/forums/c-class-w203/206694-increasing-idle-06-c230.html it seems as if it is more serious. If your engine dies at an inopportune moment, your safety could be at risk! None of us would want to hear about a bro in that situation.

Please get it checked out by your dealer or a competent independent technician pronto. When you take it in to be examined, error codes will have been stored in the ECU for subsequent retrieval, even if the CEL is off at that time. He or she will then know how to best rectify its ongoing malaise.



