Originally Posted by
wcr
Unfortunately it's not as simple as buying a new key and expecting it to work.
The key fob has two main electrical functions. First, the lock/unlock buttons are programmed to the car by code and this function requires the fob battery. It uses the battery simply to remember the code.
Second, there is a small microchip inside the fob that requires no power, for the immobiliser. This is coded by the ECM and needs to be within 3 or 4 inches of the ignition barrel to activate a positive signal.
Your new key will need both functions programmed in using op com or tech 2. Stay away from main dealers though, IIRC, they charge around £70 PER KEY.
You can have a maximum of 5 keys programmed into the one car, worthwhile if your in the habit of loosing/braking keys.
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