Hallo!
If you learn Swedisch you can build your own Interface with info from this site: http://home.swipnet.se/fredde-b/ Come on, its not so hard, kids speak it here.
Ok, here it is in English: http://www.planetfall.com/~jeff/obdii/
Then you only have to download the Sw demo from this site: http://www.ross-tech.com
And Voila! Your are your own diagnostic master!
Best of all it works! Its cheap ~20 EUR for the printed board and ~40EUR for the components. (the special connector for the car is a little bit on the expensive side but you can make it without it.)

Audi V8 4.2 (Panther Schwarz 92)