After I am getting a car it will go straight to the BMW dealership for a complete checkup. My dealer usually check for more evident problems, he knows his cars well. There is also a return policy at the auction. I should be fine.
There are actually about 15-20 diesels (2011) on sale at any given time across the country via Manheim. So they are rare, but are available with some wait, but of course with the right configuration is not easy to find. I have been looking for mine for over 6 weeks now.
Sorry to hear you got a Lemon

... what was wrong with it?