Often times during key learning the CAS receives the EWS tampering error. This error causes the car to become immobile. The way to fix this issue is to take the keys out of the car (2 meters or 6ft is a preferable). Disconnect the battery for about 20 minutes and re-connect it without bringing the keys back into the car. Try to communicate and clear the DTC. You can turn the lights on and off, lock and unlock the car, the DTC will get cleared. Then try to sync CAS EGS and then bring the keys inside the car and sync again. The tampering error should disappear and the car should start. This may need to be repeated many times but this is the only way to work with the vehicles.

Important notes

Expect to repeat this. It may need to be done many times, and there is no shorter route — this is the way to work with these vehicles.