For the loaded number drive at a constant speed of say 40-50mph. Unfortuantely LTFT or part load adaptation doesn't change quickly. It probably will take 3-5 miles and if one graphs it it should basically look like a straight line.

I'm presuming that your previous numbers were all short term at idle. Both banks showed fuel control (up and down on the graph) but B2 showed it all happening with negative numbers whereas the B1 numbers were back and forth around zero, which is the way it should be. After a while O2 sensor control (lambda) will borrow from long term adaptation and zero itself, but it can take a while. Your O2 sensor code will usually set when either control is pegged without help from adaptation or when the sensor is slow to act. This can be caused by a poor sensor heater circuit.

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