I Just got my Audi A6 avant and am looking to do something with the diagnostics outputting to a pda screen that will run a VB program to allow me to manage my music and pull in my cars diagnostics status to a GUI

Has anyone done something like this?
Can anyone recommend a diagnostics product?
Is there any way i can get a parts catalogue where it has three dimensional views etc like the Audi Service Center has?

Thanks

What year - what motor?

See the Rosstech site for VAGCom

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1997 A6 Avant
1998 Jetta
2007 Dodge Grand Caravan SXT
one High Performance Roller Skate

2001 2.8