Got any exhaust leaks? Can draw in "extra" air that gets sensed by the O2 sensor giving you a low reading.
Not a good idea to jump on the sensor straight away when you get that code. As you have shown, it may just indicate something else is amiss.
Sure there are no other codes causing the CEL?
Wow, where did this all come from? I could replace the drivers side O2 sensor with the one I took off the passenger side which evidently was not bad, but what is causing all the rest? The car appears to be running normal.
KOEOff codes:
111
10 Cyl #1 low
172 O2 sensor cyl 1 bank 1 lean
175 adaptive limits, bank2 exceeded
176 O2 sensor lean, bank 2
189 fuel adaptive limits rich reached, bank 2
KOEOn codes
136 O2 signal lean, bank 2
Cylinder Balance test, pass, no codes
Chek for unmetered vaccuum leaks with those codes. Esp if it seems to be running OK.