The new key will have to be programmed to both the central locking and the immobiliser. Do you have the keycode card?
Tbh it might be easier/cheaper to get another ECU set with BSI (though apparently its not a BSI ) and ready sync'd keyfobs.
Tbh it might be easier/cheaper to get another ECU set with BSI (though apparently its not a BSI ) and ready sync'd keyfobs.