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The O2 wire is a shielded wire. That appears to be the shielding. It should be grounded at the ECU. Typically, it is cut a lot more cleanly than that and before the wire appears from the stock tape/sheathing.
the sheath for the wire is broken, the connector is also supposed to be on the little thing and not zip tied to the harness, although its not a functional problem, just a concourse problem
