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Originally Posted by jhandy
If it is a new key that has never been programed, it will have to be done at a dealer or at least someone with a PST2. If it is a key that was once programed to your car, but has now forgotten, I have found that starting the car with that key seemes to remind it of the code.
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Not quite correct. The car has a security computer, in which are four “slots” for keys to be registered. Each key head is unique, and cannot be programmed. You program the
car to accept the
key, not the other way around. Once the key’s data has been input by either a PST II (early cars) or a PIWIS (early or later cars), the slot is forever unavailable and dedicated to that specific key. The used slots cannot be altered or erased. Once all four are used, the computer must be replaced to add new keys.
Second problems is to add a new key, you must have the barcode that it came with. No barcode, car can’t be programmed. You can, however, move the chip from a key head with a defective transmitter to a new key head, and the car will accept it as though it were the old key.