Need help with four OBD2 codes

[frriveramd]

I have a 2007 Saab 9-3 2.0T with 15,500 miles. The car has a misfire, an intermittent no start situation, and intermittent stalling while driving, along with some other problems. The car has been 13 times to the dealership for a total of 102 days to try and resolve those issues with no luck. On May 14, 2010 I took the car once again to the dealership because of the same problems. I received a call yesterday from the Service Department in which they said that the car was presenting with 4 OBD2 codes that it had never had in the past. The codes are the following: 1)B0092, 2)B1440, 3)U1501, and 4)U2105. Can any of you guys tell me what those codes are and what could be causing them to show up?