I have an entire wiring harness from a Q7 in the loft somewhere. My Audi dealer mate gave it to me years ago because I like to harvest the connectors from shagged looms
Anyway, that was the fix for a wiring fault in a customers car. Couldn't fix it for love nor money, so had to put an entire new harness in. Crazy expensive job.
The MK1 Q7 / Toureg / Cayenne, along with the MK1 Audi RS6 are well renowned for being wallet busters. Electrical gremlins and air suspension woes mainly.
Plus they are horrible obnoxious machines I end up being stuck behind for miles, so can't see what's going on up ahead.