the only one who can tell you is a Mercedes dealer
P202C-004 = CAN BUS signal from EIS controller,CAN BUS signal error
the only safe way is to drop the tank. ( DO NOT DRIVE THE CAR OR START THE ENGINE WITH PETROL IN THE FUEL LINES EVERY THING FROM THE TANK TO THE PUMP WILL NEED TO BE CLEANED. If you had he car towed back home without starting the engine then removing the tank and draining fuel should do. A lot depends on how much diesel was in the tank when you put the petrol in. How much petrol you put with the diesel before You realised the error and whether you got neat petrol up to the injectors. Its a common error running the engine for a few seconds wont matter to much but you don't want petrol in the injector pump at all. If you no very little about mechanics let a professional do it for you as mistakes can be catastrophic.
It will return various error codes or the car will not function at all. This is very rare.
Trouble code P0105 means: Manifold Absolute Pressure (MAP) Circuit Malfunction
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The error code on your Mercedes-Benz is a reference to a vacuum control problem. There probably is a plugged vacuum hose leading to your engine.
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