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Hi, can you give me some background on this problem?
Does the check engine light turn on when you turn the key on? Does the glow plug light turn on when you turn the key on?
Glad you got it going. It can take forever to prime the fuel system after replacing the fuel filter. The check engine electronics light is telling you that a fault code is stored in the engine management computer. You will need to get the car connected to a Mercedes diagnostic tester in order to read and erase the fault codes.