ECU Swap through VAGCOM:
Immobilizer III ECU Swapping - Ross-Tech Wiki
Pin code determination:
4.15 How do I obtain an SKC for Immobilizer and Key-Matching functions?
We do not know of any way to retrieve an SKC for VW/Audi/SEAT/Skoda vehicles. Prior to 2002, some vehicles were delivered with a scratch-off panel on a plastic tag that contained the 4 digit PIN code. Starting in 2002, dealerships implemented the WIN2 system to provide SKC's to their technicians and customers. Starting April 1, 2005, VW/Audi dealerships switched to the new GEKO system, whereby their factory scan tools dial up the factory while connected to a car. Under this system, the technician no longer sees the SKC at all and you will need to bring your vehicle into the dealer to have Immobilizer work performed. VCDS does not interact with the GEKO system. Check out our Immobilizer Page for more information and procedures.
If you had
Immobilizer 2 and 3 Key Adaptation - YouTube