Thought this may be of use to someone out there. I spent most of yesterday trying to work out how to turn on the outside temp display on my A3 (type 8l) which has the low line dash (no DIS) after searching around a few other people have had this problem but noone has found a solution. All A3's should be able to display it, so heres the fix. I used VAG COM 3.1 but should work with any version!
Plug in vag com cable
turn ignition on etc
Goto select control module
Click on 10-Adaptation
type in 19 in the channel selection, and click read
make a note of current readings
On the second digit from the end, e.g. xxx?x it should be reading 0. Replace the 0 with 1 and then save, go back.
Remove cable start ignition tada!
The outside temp should now be displayed.
P.S. usual disclaimer, do it to your vehicle at your own risk, if you make a balls up of it your problem not mine!