Hi guys, I had my 2003 S3 up on ramps last week and discovered a disconnected cable behind the rear n/s wheel. The car is driving perfectly, and there are no warning messages on the dash display, so I've no idea what it's for. I checked behind the o/s rear wheel and there is another cable there but that one was connected. It looks like some form of thin plastic cable housing (approx. 5mm dia.), not dissimilar to a brake cable on a bike, and enters a 90 degree braided connector.
I have a picture of the cable I'm talking about, but I'm not sure how to post it on here.