Did you disconect the battery at any point leading up to it? From memory it displays 01, 02, 03... each time you enter the code...
Does the radio still work?
Perhaps you should try and re-set it by d/c the battery.
Bora has gone ;( Custom sub box and beige floor mats to suit for sale.
From Memory error 4 usually means that you have a problematic CD lense or your CD's are scratch therefore you cannot read the CD's.
At least that is what i can remember a year or to go one of my friends car radio here did it, so we simply removed and installed a new radio.
Audi S4 (2001) - Imola Yellow
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