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I had the same water damage problem with my 99 Boxster. I bought a used immobilizer, ECU, ignition with key, and drivers side door lock as a matching set and when I installed everything car still would not crank or anything. I basically wasted $400. I had read somewhere that removing the circuit board from the immobilizer and dipping it in 91% rubbing alcohol would sometimes work. I removed my circuit board and filled a Tupperware container that was large enough to accomadate the board with about 1 inch of alcohol and used a toothbrush to clean off all the mold and all the other gunk left behind by the water damage and left it overnight to dry. The next day I put the board back in its casing and installed the immobilizer, original ECU, and ignition and to my surprise the car started right up with the only issue is that the passenger side door still does not lock. This is after weeks of trying everything else and having a totally dead immobilizer. I did this only with the notion that it wouldn't hurt to try never thinking for a second that it would actually work. For anyone else who has an immobilizer with water damage I suggest giving it a try as it will only cost you less than $2 for the rubbing alcohol and there is always an extra toothbrush around the house somewhere. Good luck and I hope it works for you should you try it.