For the original poster - I recommend that you beg, borrow or buy a VAG-COM scanner from Ross Tech. This will read and decode the unknown codes which are Audi specific. They are much more detailed and often point you in the right direction for the fix.

A VAG-COM scan will also help giopep find his problems.

 

Was someone able to help you with why this happens? Can you share the information with me? Bought the cat for my wife and I feel bad because she can't drive it...