If your Mercedes E Class W212 Comand has failed and cannot be repaired then you will have to replace it.
You can buy a brand new one but will be very expensive.
If you buy a used one from a breaker then it will need coding and programming to match your vehicle.
As the car realises that the comand radio is not from this vehicle the anti theft will be activated.
So long as you can provide proof of purchase we can retrieve the code from Mercedes UK and sync back to your car. If you require your Comand coding please call us.