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Dealership must access code and will reset. They charge between $30-$50 to do it. Get the code from them so you can reset it next time.
More Info.
In your manual book (Sound System Symphony) dealer gave you had a radio card which came with Serial number & Code number of your radio unit.
Every time you change battery or car doesn't have power source the radio will have "SAFE" displayed on your radio screen. It is time to reset your radio.
To cancel the electronic code (Anti-theft coding) here is step from Audi manual book. That what I did for my Audi A4 2001 1.8T Quattro Turbo
Hint: you must have radio code number from dealer!!!!
1) Turn radio on - the word SAFE appears in the display
2) Pres the P.SCAN and RBDS button simultaneously and hold them down until "1000" light up in the display.
3) release buttons. Do not, under any circumstances, continue holding them down or press them once again. This would cause the radio to consider the number "1000" to be the input code number.
4) Use station buttons 1...4 to enter the code number on your "Radio Card" from manual book. Use button 1 to enter the first digit of the code number, button 2 to enter the second digit and so on. Station buttons 5 & 6 cannot be used.
Once the code is shown in the display, press the PSCAN and RBDS buttons again simultaneously and hold them down until the word "SAFE" appears in the display.
5) release buttons. Soon afterwards, a frequency will displayed.
6) THE RADIO CAN NOW BE USED AGAIN.
Repeat all the steps above if the radio is failed to pick your code
Good luck
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