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Looks the RFDI chip in the key is defect. Your Mercedes car dealer should be able to help you with that.
Fist to make sure it is a chip problem in the key and second by replacing the chip and the code and / or replacing the battery it an empty battery is the issue.
The fastest way to check a radiator fan is to turn on the a\c while idling , this should automatically turn on both fans at once, if they don't come on first check the fuses then the fan relay. If the motors are working when the a/c is on then your thermoswitch has gone bad (its located somewhere on the radiator, look for two wires coming out of it)