I have one from an 88 b.h.p 25 tdi blue i.
Not sure if these are coded to the keys????/
if you can get a part number from yours you should be able to cross reference with someone on here.
Sorry I can't be more help
I maybe wrong, but isn't the key coded to work with your ecu? You might be better off trying to have a standard map flashed back onto your ecu, a local tuner or dealers might be able to help?
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