[JC]

I have a spare AU2 radio/CD deck (with code) guaranteed to work. $50 (plus postage) and it's all yours.

Now, having said that, I remember someone else having problems entering the code and it came down to them not pressing one button hard enough. Also, you may have to leave the radio on for an extended period of time before the Err code will go away. It's part of the anti-theft feature of the unit. I think after you enter an incorrect code, you have to wait 2 minutes, then 5, then 15 then an hour and so on. Might be worth disconnecting the car battery and leave it off for 10 minutes, then reconnect and see if that makes any difference (not that I think it would, but worth a shot, and it costs nothing to do!).