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It just unscrews.....easy peasey
Perhaps from the exhaust system. Not from the wiring harness, I don't think.
Yes.....actually the connector on the wiring harness just unscrews.....it has a oversized coarse thread with the electrical terminations inside.
I replaced my catalytic last week and didn't go so far as to disconnect the O2 sensor from the wiring harness. If I had, I would have known.