mfm22
The board inside the key fob isn't programmable. You have to basically program the car to accept the codes that the board is sending (it's a one way kind of thing - fob --> car)
When you buy a key fob it comes with a tag that has some long code numbers on it that have to be programmed into the car by the dealer (or someone with a PIWIS or PST2). Without that tag all you have is a nice looking but useless key fob. I suppose the boards are small enough that if you had a couple you could make earrings out of them, or a pendant, broach, etc.
There's also a small glass tube inside the key fob that works with your cars immobilizer. The number on the tag that comes with the fob has to be programmed into the car to enable that too (I think - others chime in here and correct me if I'm wrong and I will edit and correct this).
If you buy a used key fob from ebay and it's missing the factory Porsche tag, you are basically buying it for the outer casing and/or any parts that you can salvage off the circuit board (battery holder, switches, etc).
Hope this helps.
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2001 Boxster S - Speed Yellow, Black Leather, Tiptronic, Jake Raby rebuilt 3.2 with IMS Solution
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