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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.
When check engine light comes on, one or more diagnostic trouble codes (DTC) are stored inthe engine control module.maxiscan eu702 can do your car help you clear the fault codes.
Their are different kind of services, the more you drive, the more and deeper service is required ! get your self a owners manual, all required service intervals should be listed. If this is your question ?
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