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Hi all. Just a brief update, following the advice of ike84, I checked Amazon for the Bosch oxygen sensors. I'm not sure why, but I haven't purchased parts for this car from Amazon before. Anyyyyyyway, the sensors have full refundability and were at a lower price point.
Plan now will be to swap in new O2 sensors when I pull them to back-pressure test the cats. I will perform an overnight "hard-reset" (poor-mans handover) of the ECM the night before and, provided cats pass the back-pressure test, go for a test drive and collect a good deal of clean data with (hopefully) known-good cats and new upstream O2 sensors. I'll report back following these efforts.
As usual, thanks all!
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