does any one know how to get in the sistem? so far i have only changed from C to F (temperature).

 

You may want to try this for the codes. but I don't know if it will work with the B6. This is the closest I could find to what you asked.

Here is another post. It was given by an A6 owner who explains how to get into the system to change the codes. Again, I can't guaranty this will work for you. If you want to try to find something that is exactly for your B6 A4, you can try searching AudiWorld.

Hope this helps!