UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Welcome to ja.come
I hope I can help you today.
It is very rare for the key to lose contact with the car like that but I know from past experience that the keys do stop talking to the cars.
Unfortunately though with these Mercedes cars you cannot reprogram the keys to the car. They come coded from the factory and you have to order them from a main dealer. The keys are quite expensive as well approx 200 euros. The key will come and will look different from the original as it is an upgraded one and will come with a blank blade in it which will need to be cut to the car so that you can use it in an emergency. Your original blade won't fit into the new key which I think is silly.
I hope this helps you and if you need me in future please feel free to ask again.
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Thank you in advance