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How to Program a MERCEDES Truck Key If you require replacement of the battery or your key stopped working the parts department will be willing to assist you. Note that replacement keys can only be purchased and synchronized in the store. This is to ensure your vehicle's safety and security. This service can only be requested by you or a person authorized to request it. Keys Some have claimed that you can change the programming of your Mercedes key. This is not factual. The key is programmed "for for the rest