Had all the O2 sensors off for headgasket repair and labeled them all with tape for reinstall. Damn tape came off 3 of 4 in humidity so I’m sorta stuck on which is which. The one labeled is front back of exhaust and has black and grey wires under the insulation. There is another similar, assume it goes rear bank exhaust.

The other pair is yellow and red wires. Assumed these go under the car at the pipe connection.

Right? Wrong? Any way to determine which is which or is it a cable length logic?


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