BMW 3 series owners, help!

[towernick]

Hey guys, on Sunday I got an "engine malfunction, reduced power" error twice. I brought it to the dealership today and just received a call from my service advisor stating they were still trying to diagnose the problem and they were going to keep the car overnight.

My car is a 2011 335i sedan with 38,500 miles on it. From the very little research I did, I thought maybe it was a lingering fuel pump issue, but the service advisor didn't mention that. I am the second owner and have had zero issues with the car so far. Any ideas, could it just be an error with the computer or should I expect a major issue. I'm still under my factory service warrenty so I won't pay for anything but if anyone has any ideas, i'm all ears. Thanks in advance.