Not sure you understand mate ! I did not miss anything !
Depending on what year your car is there are at least 10 different A3 models and 5 different engines !!!
I meant :- petrol/diesel. 1.6, 1.8, 3.2,/1.9, 2.0, CR or PD dependent on year
Please provide all info in future so that the advice can be accurate
Contact NHN on this forum to purchase VCDS. It's about £250