SOURCE: Why does my 1992 MB 500sel not always start on the
The 2 things to help start at first try are the coolant sensor and the cold start valve. If the coolant sensor is bad , it give an erratic resistance so the cold start valve could not open to assist the start. If the cold start is not open then you have not had the assist from the cold start valve. Good luck.
SOURCE: I REPLACED NEW BATERY ON
It sounds like a security system issue. The only solution is to contact a dealership for help with the code. It involves the on board computer system and has to be hooked up the the scanner at the dealership.
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