Ok some know that I just bought a 95 Audi A6 with 87,500 miles on it. Now I have a diagnostic tool, WHERE IS THE PLUG! I've looked under the dash where most cars are located at, I've looked under the back seat. I have no clue. Anyone know?

In the engine bay - fuse/relay box under the cowl, driver side.
You'll need a 2x2 to OBD2 Adapter cable you can find onEBay, or elsewhere

sweet thanks, guess I should just message you directly LOL

I typically butt-in to topics I ran into myself, and topics I know about or think I know about , so there's no problem whatsover if you ask. you're welcome.

Would that be the same place for an S6(C4)?