Radio Code
WARNING: This page is about a different car, the 2003 Audi allroad, 2003 Audi TT, 2003 Audi S6, 2003 Audi A6, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
If the vehicle battery is disconnected and then reconnected, radio will require anti-theft security code to be entered. Coding instructions are located in supplementary audio systems manual supplied with owners manual.