My lack of expertise in Bosch KEIII diagnostics is now legendary, but I like the term "Capn'ed" to describe generating current for the O2 sensor circuit!!
Here is what I do know, my car needs the wiring harness replaced before I can get any consistency in readings. I know this because when my car is in it's failure mode I can grab the harness near the controller and it will run good. Also with the KOIO I can grab the harness and hear the fuel pumps engage.
Now, with that said, MY problems may not be remotely connected with any of the others stated here.
StevebFL is the expert here. However, not understanding the system unfortunately prevents me from understanding his commentary. The more I study this system the less I seem to understand it. I'm hoping that the wire harness is the reason my test results are so confounded.
I'm an old dog, but I hope I can still learn (and understand) a new trick or two.