I've also had a check engine light on 2009 35d. 2 short months after purchase and 3,180 miles.

In this case, as with others, forced to schedule appointment for simple scan of fault code. Result?... Oh look, bad (I still laugh at this one) "KNOCK" Sensor. A "KNOCK" sensor in a diesel, uh... isn't combustion by compression the way this thing is suppose to work. Ah, wait... maybe you mean "NOX" sensor... Oh Yeah! That's what we meant. Now, wait for it.... wait... wait... Oh we don't have that, we'll have to order it, but not just order... wait... wait... wait for it... Oh you mean BACK ORDER, and let the waiting begin (Sorry Craig, had to add that offer that to let you know your not the exception, seems to be the norm!)

What? It's November already? Oh BTW, your part finally came in, drop by in a week or so and we'll drop her on in!

So... part installed, codes cleared... But I've yet to discover what part is...

13628509719, any ideas?

We'll get into the "Engine Malfunction" light popping on for a few minutes then going away on while still driving. Due for first service, so we'll see what codes await if dealer feels like sharing. Maybe the latest discussion on code readers will drive me out to get one to see fore myself before dealer gets ahold of her.

Great information on the site, been extremely useful and hope I can offer some useful posts as well.