Best bet is to go to an Audi/VW dealership, and have them reset the radio by using a VAGCOM. The other option would be to purchase a VAGCOM yourself (http://www.ross-tech.com/). Of course if you have the actual reset code, you can enter it in manually. I can't tell you specifically how to enter it on the Audi radio, since I have an Audi Navigation system, and the controls are different. But it should be a combination of using Volume and Seek (or other keys the would allow for scrolling) to enter in the code.
To reset the radio code in a 1997 Audi A8, you typically need to turn on the ignition, then turn on the radio. If the radio displays "SAFE," you will need to enter the correct code. This code can usually be found in the owner's manual or provided by an Audi dealership. If you don't have the code, you may need to contact a dealership with your vehicle identification number (VIN) for assistance.
unless you have the 4 digit number you cant...a visit to Audi is the only way
http://www.ibiblio.org/tkan/audi/radios/concert.html
In the Audi booklet there is a number u must enter or call Audi dealership with Vin number
To reset the Audi radio code when it displays "SAFE 2," you'll need to enter the correct security code. First, turn on the ignition but keep the radio off. Then, hold down the "TP" and "RDS" buttons simultaneously until "SAFE" appears. After that, use the radio preset buttons to enter the code, followed by pressing the "TP" button to confirm. If you don't have the code, you may need to consult your owner's manual or contact a dealer for assistance.
Your safe code for your radio is unique to the vehicle. You can go have it reset at an Audi dealership for $20-40 dollars.
You have to call your nearest Audi dealership and address your problem to them. Have your VIN (Vehicle Identification Number) ready. They will ask you for it. If the radio is not originally from the car, you will have to have the serial number to the radio ready. They will after tell you the code via phone.
You need your operator's folder. In there is a booklet about the radio. it will have a code you need to enter to get the radio out of "safe" mode. the code is unique to each radio and car.
mostly audi concert 2 radio's
1996-2001 Audi A4 1998-2005 Audi A6 1997-2003 Audi A8 The flasher is located on the dash above the radio, it is te same unit as the hazard switch.
Indicator lights on an Audi can be reset by a mechanic. The cars manual will also give instructions on how to reset this light as well.
Hit the AM radio button. You did not say it was a factory radio though.