The Radio "Anti-theft" code use to given from dealer ( first owner bought the car) If you don't have or lots the code you only can get the code from dealer.
In manual book "Audio Symphony" book have the radio code it calls "Radio card"
Thief!
go to the dealer
http://www.ibiblio.org/tkan/audi/radios/concert.html
unless you have the 4 digit number you cant...a visit to Audi is the only way
Trouble code P0347 means: Crankshaft position sensor "A" low input (Bank 2)
You need the serial number from the side of the radio and also the VIN number. You call an Audi dealership and give them the two numbers and for a $30.00 fee they will give you the radio code to take the radio off of "safe" mode. Lewis Powell
your code is unique to your car... you'd have to get it from the dealer if you lost it.
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.
you turn the key on and off 25 times and the radio works as good as new.
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.
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.
unfortunatly, Audi has designed there radios to lock after a loss of power. they claim it's to prevent theft, however when you battery goes dead it locks up. the only way to get he code is to take it to the dealership at a $100 an hour charge and a minimum of 1 hour. My advice is to get an aftermarket radio