BT Module coding
0011422 would be for nav unit, A3 and MFSW
0001222 would be for symphony, A3 and MFSW
And yes you should check the box in the can gateway to say you have a BT module installed
Also you can code the radio to add telephone option
Can't remember on an A3 if you need to code the steering wheel controller also, it's been a while
All of these things come up in the coding helper when using VCDS to code.