Chuck,

It would be real helpful to see the adaptation numbers for both sides both loaded and at idle.

You have something going on on bank 2, for sure. The interesting thing is that O2 sensor control is attacking a rich condition but your B2S2 is showing a lean condition overall. could be a lying B2S2 I suppose, you might try disconnecting it and seeing how those trim numbers change. Unfortunately fuel trim numbers give a very poor indication of MBs adaptation system as LTFT has only one value and MB uses loaded and Idle control. O2 sensor control or lambda is pretty much the same as STFT.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician