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I had an issue years ago with a 2001 Boxster where the horn would work with the ignition off but when the car was started, the horn would not work. If I recall correctly the horn ground was the issue. The horn would find a ground with the ignition off but once the car was running, the ground disappeared. My mechanic discovered a broken wire coming off of the horn button where the wire makes a 90 degree angle. He fixed the wire and the horn worked normally. The issue was discussed on either this forum or the old PPBB. If you do a search you should find more info.
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