Hi,
The VAG COM uses OBD2 (and the lead I have supports the CAN bus also).
My last car which was a 1.8T 20V GTi only used the OBD2, and received sensor updates on a poll as you said, because when you read three sensors simultaneously, the update rate was 3 times slower so I guess it was polling them in a "round robin" style..
So as far as the software mentioned in the comments in the post, will these generally support my first 3 on the wish list?
What would people recommend for these? Also I am guessing I will need a new lead since the VAG-com one will not work?!
Ah well jus wanna be able to diagnose the Z even though there is nothing wrong with it, how sad is that!!!