I had the same error appear (66 plate A4) on Sunday after returning from a 40 minute drive. Luckily I was on my road and was able to park up within a minute of it appearing. Didn't drive it again while trying to discover what the issue was which, having read the advice on this forum was the right thing to do. Ordered my part from Audi parts direct (which appears to be the Audi main dealer in Cardiff), fitted it in less than 2 minutes and everything is fine again.
Cant thank the people on this forum enough. The Audi dealer in Wolverhampton refused to admit they had come across this issue before and insisted that I needed to pay £144 for a diagnostic!!!. The fact that you can buy knock off versions of this part on eBay, tells you there must be a market for them. Audi should be ashamed of themselves!!
