EasyDiag OBD-II Reliablity

[OldWolf66]

I have an E 46 Bimmer. I recently bought a Launch Tech EasyDiag OBD-II reader with software for BMW. The problem is that the EasyDiag gives slightly different problem descriptions for a particular Diagnostic code than does the Haynes manual. They both relate to oxygen sensor problems and the difference between the two sources means the difference between which sensor is the problem.
Does anyone have experience with either the EasyDiag vs. Haynes? How about which sensor is mostly likely the one to fail?
Any help will keep me out of the dealer or local shop.

Or - if anyone has a Bently manual and would be willing to look up a P0037 code I would be greatful. I know iy relates to a failing oxygen sensor, but which one?
Thanks