Ok i have an ancient inherited 312 Vagcom on the laptop i bought from the 'Bay many moons ago and want to add an alternative ECU to my immo2 1999 A4. I have the 4 pin SKC and login no problems, i can adapt the dash to the new ECU and the immo light goes out. I try to start the car and it shows classic immo problems, upon reading the codes i find the dash is clear by the ECU shows immo prevented engine start. I followed this to the letter, http://www.ross-tech.com/vag-com/cars/immobilizer2.html The same proceedure worked when i recoded the same ECU to my 1998 car, which i assume is immo1. Is there something i am missing? Or are the later non serial cables able to do things that this one cannot?