Tools like the Car Radio Code Calculator app allow you to input your serial number on a mobile device to generate codes for various Audi models. JustAnswerhttps://www.justanswer.com How To Retrieve Audi RNS-E PIN Code Using Serial Number?
Many RNS-E units display the serial number across the bottom of the "SAFE" or code entry screen.
In North America, some users successfully retrieve codes for free by calling Audi North America (1-800-822-2834) with their identification and serial numbers.
If not on screen, you may need to slide the unit out using Euro radio removal tools to see the sticker on the back or top.
