Not to throw cold water on the 911 procedure, but my experience was different for my 986. I purchased two new key heads from Suncoast and took the car to my independent repair shop. It was able to re-program the key using its Autologic computer.
Here's important part. The shop needed two codes. One was the code that came with each new key. The other was the immobilizer code. This was only available from the dealer, who was generous enough to provide it to the independent shop. With both codes in hand, the independent programmed the two keys in about 20 minutes.
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