Two in the foreground are red/white stripe.
Only a few inches from this connector the wires disappear into a larger wire bundle wrapped in black tape that all goes into a plastic conduit. I guess I have to either disassemble the black tape and locate the splice or peal off the sheath of the suspect O2 wires and look for a shorted wire.

FYI it get continuity on both upstream wires (zero on downstream) at this connector as well as continuity to chassis ground in 4 of the six connecting points.


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