Hi Jim ... I think you need to get a key code from your Audi dealer. You give them your VIN# and get the access code. A lot depends on which date unit you are dealing with. Here's a site that deals with VWs and Audi with the Immobilizer II cluster (http://www.ross-tech.com/vag-com/cars/Immo2-cluster-swapping.html) it might give you some insight. The quickest route to your solution however is a call to your local Audi dealer. Good luck!