Reading with O₂ connected doesn't mean anything. You will probably get some resistance value but it's though the DME not helpful.

If you found any that read not OL that's the job you were tasked to perform.

It sounded like it would be an upstream sensor maybe melted to exhaust manifold. You are very close to solution.

Dreaded trans. Failsafe prog.
 

Ok, progress. As expected/predicted when I pulled back the sheath on the bank one, upstream O2 part of the 4 wires were fused and shorted (likely got too close to the exhaust manifold. Gonna butt splice all 4 wires or figure out some way to peal them apart without breaking them, reassemble the rest and hope that ends the ordeal. I’ll post back after I get there, probably inspect bank two to be sure that aren’t suffering similar fate.


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Yep, that'll cause a short. Nice you found it in what looks to be a serviceable space.

Lucky about that, kinda right in front of me. Might solder splice and heat shrink so I can hide my handiwork under the sheath…..


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Use these.
https://americanclipsandconnectors.c...r-sleeves-blue

Makes for a clean repair. Then heat shrink over that.

Those wires look more like they got crushed than melted.

Possibly a combination. At some point those might have been pinched by a valve cover or something.

They were sorta melted together so when I separated them they distorted. Right in the area that could have laid on the exhaust.

These are .5mm wires, I will replace most of the red/ws and splice a few inches of the 3 others. The parts stores near me have 18 gauge that is slightly larger than .5mm. I have some salvage parts from an e46 with .5 mm wire for the yellow, black and brown wires( not the same colors but wouldn’t think it would matter) but will be running at least 2 feet of red wire to 12v. Will 18 gauge work instead of .5mm?


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Is there not enough slack to just splice them together again? There is usually a good amount of length on the O2 sensor side. Reason I say this is that 1 splice is better than 2 :)

Thought about that, I need to get a closer look for damage. Concerned that an O2 wire needs to be stout or the readings will be off and cause a CEL.


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