I think I’m close. Did Resistance test you and Andrew Wynn suggested. Cut the crimp, separated the red/wS wires and read resistance all OL except one. Of course my DIMM battery died in the process and it got dark so back at it tomorrow. Likely an up stream wire crossed the exhaust manifold but haven’t isolated it yet.

Re-reading your suggestion with the O2’s connected should not read OL? But with O2 pigtails disconnected OL is correct?


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