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How to Program a MERCEDES Truck Key If you're looking to replace the battery or your key has stopped working, our parts department is willing to assist you. Please note that replacement keys can only be ordered and synchronized in person at the dealership. This is done to ensure your vehicle's safety and security. Only you or a person authorised by you may request this service. Keys Some have claimed that you can change the programming of your Mercedes key. It's not the case. Once paired, the key will not work with any other car. T