They all have an eeprom chip in them to act as the transponder for the immobilizer.I didn't realise that they are coded
Pleased I got a spare then mateThey all have an eeprom chip in them to act as the transponder for the immobilizer.
The chip can be read by an autoelectrician and a blank chip programmed other wise the key may open doors and work the looking but it won't start the car.
I looked into it as i only have a single key.
I seem to remember that the diamond shaped keys like for my Z4 need to be rotated in use to maintain the battery in the key. I don't think that applied to the round ended key that my Z3 had though Alan.I too have two keys , both will open the locks and turn on the ignition but only one will start the car. Both keys have transponders. I have been told and I don't know if it is true. If a key is not used for a long period of time the the immobiliser won't recognise that key when it is used. Does anyone know if this is the case and if so what can be done to bring the key back to full function?
Does it unlock the doors when you press it or do you mean it opens the door when you insert the key into the door to unlock ?I too have two keys , both will open the locks and turn on the ignition but only one will start the car. Both keys have transponders. I have been told and I don't know if it is true. If a key is not used for a long period of time the the immobiliser won't recognise that key when it is used. Does anyone know if this is the case and if so what can be done to bring the key back to full function?
I've just been out to try the suspect key and it does everything it is supposed to apart from start the car.Does it unlock the doors when you press it or do you mean it opens the door when you insert the key into the door to unlock ?
If its a case that it does not open via the unlock button then you can re programme the key to the car. I did a thread ages ago when i had the Z3