Good evening. The key from my CLA 117 no longer works. The doors can no longer be opened and closed with the key. The ignition starts when I plug the key in and the engine starts perfectly. I tried it with my spare key, exactly the same problem. The start stuff button also no longer works, I get the message that the key is not recognized. Battery I also changed but did not do anything. I have to open and close the car with mobile phone. Does anyone know where the problem lies?