Important please read
 

DO NOT continue to try and start the car with a failing battery.

There is a possibility for the transponder chip in the key to become corrupted as it can scramble the rolling code with that stored in the immobiliser.

The engine disabled icon will display on the instument pack and you will no longer be able to start the car using that key.

To reduce the risk of this happening the best course of action is that if your car will not start as normal and the headlamps start to flash Don't continue to make attempts to start the car until you have charged the battery or replaced it if the battery has failed.

However should you be unfortunate and find that this has happened then any of the club members who offer the replacement key service should be able to re-sync the key with the immobiliser.


Russ

Important please read
 

Hi as Russ has pointed out, this is a very real issue with the immobiliser system on our cars.
This is the third time we have encountered this problem, firstly on my own new car, where it had been incorrectly diagnosed as needing a new ecu, secondly here http://www.the75andztclub.co.uk/foru...d.php?t=105390 , and one of Russ's customers last Sunday.
There is information relating to this problem in BMW circles, whereupon the only known cure was to order a new key, however as Russ says, we are able to rescue "scrambled" keys, however the EWS immobiliser would require removal from the car for reprogramming.
Brian :cool:

Sound advice there :bowdown: thread locked and stuck for reference.