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I have just bought an audi a4 tdi and the radio has lost its code.I managed to get the stereo out and it has model no 4b0 035186 and serial number AUZ 523w0038426 can any kind person supply me with the radio unlock code/
I had the same issue and I found a post to ring audi in USA...
Originally Posted by mohohunter
If you want the radio code for free you can call Audi USA and they will give you the code. You will need to call in with the radio Serial number (starts with AUZ) and the VIN number. They will give you a call back in an hour or so with the unlock code. The phone number is 1-800-822-2834. Also a place that I often find the code in in the trunk (within the wheel well for the spare tire). This is a place that is often overlooked. Sometimes this has been removed but is worth giving a look.
It bloody well worked!! I know... expensive call to USA but it took me 5 mins and now I'm a happy camper with my wonderful stereo playing!