Just bought a A6 2.7t with cam belt failure, and was trying to find info about it.
Searched tonnes of site and came across this one which worried me at first but turned out to be amazing!!
http://carinfo.kiev.ua/cars/vin/audifull break-down of all PR codes and details.
Thought i should share the site.
Also you will be getting a lot of questions about repairs from me soon.....