Thanks Jon - you hit it outta the park! Indeed, I now clearly see them on
either side of the cat. conv.: there are 2.
I can also say definitively that the pressurized p/s line leak was
completely unrelated to the O2 sensor issue (contrary to anecdotal theories
posted on another forum site).
The sensors appear to be fastened w/ a 7/8" nut (possibly 22mm). The front
one has a pigtail ~9" long; the back one a pigtail ~18" (4 wires to each).
Other than that, I wonder if they are "identical".
Seems like the next steop is to replace both and see if the nagging code
clears.
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