I have an 1998 audi a6, the radio is in safe mode. I red the other responses to the solution to this problem but how long do you have to hold the SCAN and RDS buttons? I held them for about 2 minutes but it didn't get me anywhere. Any assistance would be greatly appreciated.

Turn on radio - the word SAFE will appear in the display. Press th P.SCAN and RBDS buttons simultaneously and hold them down until "1000" lights up in the display. Release buttons. Do not, under any circumtances, continue holding them down or press them once again. This will cause the radio to consider the number 1000 to be the input code. Use station buttons 1,2,3,and 4 to enter the code number on your Radio Card. Use the button 1 to enter the first number 2 for the second number 3 for the third number and 4 for the last number. Once you have entered the code and it shows on the display,press the P.SCAN and RBDS buttons down again simultaneously and hold them down until the word SAFE appears in the display. Release buttons. Soon afterwards a frequency will be displayed.

For a 1998 Audi Quattro with a Delta radio, the button combination is DX and FM1/2.