'01 S80 T6 throwing multiple codes
 

Tech....please help!! My car has gone crazy---!! 2001 S80T6 with 153k has just thrown six codes.....P0031,P0155,P0037,P0057,P0136, and P0156. It still runs and drives fine, but I don't know where to start diagnosing the "major surgery" it seems like it may be needing.

Any input will be greatly appreciated!!!

Thanks in advance!!