[masraum]

Are we actually talking about OBDII scanners or are these scanners that look at other proprietary codes via the OBDII port, but are actually on the CANBUS?

For instance, durametric and iCarSoft have tools that will read and potentially set options in the computers of modern Porsches, but I don't think those options are considered OBDII, are they? They are proprietary and the only "OBDII"ness of them is that the path to them is via the OBDII port.

In that case, i think you'd need something (Foxwell, iCarsoft, durametric) and then the correct manufacturer specific code (BMW, Mercedes, Porsche, etc...). I think to get one that could talk to all brands (probably a per brand cost) would be cost prohibitive unless you have your own auto shop.

I don't think a generic OBDII scanner is going to do the trick, but I'm happy to be proven wrong.