If the O2 voltage on bank 2 is stuck at .03 then that is a problem. INPA or almost anything else would give you a better look at what is going on. I would bet money that the problem is with your wiring or you damaged an oxygen sensor or maybe even the DME with your testing. Maybe switch the O2 sensors and see what happens.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)