Well, at least so far I have learned there is such a thing as wide ranged O2 sensors, or "air/fuel sensors". It threw me for a loop at first that my OBDII software said that the O2 readings were not available. The above data lists voltages for the downstream O2 sensors, but not for the upstream. After watching a few YouTubes, I realize that my upstream sensors are the wide ranged. The OBD Fusion software displays current and a fuel trim % for those, instead of a voltage. Still scratching my head to figure out how I can make a diagnosis out of all this....

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2009 X5 3.0
2001 X5 4.4 - Sold