Timing belt (when was it last done), Torque Converter (could go at anytime if you're above 50k miles, could be good for a while). I would get some sort of return/repair policy if you can. It's easy for them to clear codes that could come back soon after purchase. Drive it for a while then have your mech run the VAG, still won't get everything if there is something that takes a chunk of miles to show. Make sure it drives good in general, good luck!