I own an American spec 2001 A6 2.7 Turbo with close to 50,000 miles. I live in Germany and drive an average of about 100 mph every where I go. This car has been fabulous and I love it. Lately, however, at speeds around 80 mph and with temps at around 30 degrees fahrenheit, the ABS & ESP Lights come on simultaneously and maybe stay on and maybe not, but only at or above 80 mph and when its cold out. The German dealers say the car checks out fine on the computer tests, but where I live there is rarely a quattro (although plenty of Audis) and the mechanics admit they don't see the American spec model too often either. According to the owners manual, when these lights come on simultaneously it means major safety systems are not working, which is not good if that is actually the case. Maybe this is just a quirk, but I was hoping someone might have some advice. Thanks.