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How to Program a MERCEDES Truck Key Our parts department is happy to assist you, whether you need to replace a battery or if your key no longer works. Be aware that replacement keys must be purchased and synchronized at the dealership in person. is done to ensure your car's safety and security. Only you or a person authorized by you may request this service. Keys Some people have claimed you can change the programming of your Mercedes key. It's not true. The key is paired "for the duration of