Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, my name is***** first thing I would do is check the fuses in the overvoltage protection relay. The relay powers the engine management system. If the fuses are blown or the relay is bad it will cause the car to be hard starting when cold and won't run well until it warms up. The relay is located behind the battery on your car. It is a small silver relay with a lid on the top with one or two fuses under the lid.
Let me know what you find.
You're quite welcome. Remember, this relay is located behind your battery.