I feel like this rates 'newbie' status. Just finished buttoning up a relatively intense tear-down that lasted several months. I made my new O2 sensor harness about 4" shorter than the one I removed, but I still have about 2-3 FEET of extra wire down there, mostly in the truck-side of the harness, but also 100% of the sensor-side harness is surplus. I can't for the life of me figure out where all that mess was hiding before I tore it down. Was it just strapped to the top of the crossmember? There seems to be a (obviously broken) plastic clip up there. I traced it back up to the engine bay and it seems to be captured in all the same "flexi-finger" traps and plastic locks along the transmission and t-case that exist, so I'm baffled.

Thanks!

'92 extended cab, 3VZE M/T, by the way.

 

A picture would help. With 2-3 feet extra, you don't have it routed correctly or to an incorrect sensor or something similar.

 

I'll get a better picture later, garbage phone cam.

I only pulled the transmission, so the harness never moved beyond that, and unless I'm missing something, I'm about 99% certain it's routed correctly all the way back. My only guess is maybe the sensor side is WAY longer than OEM. I copied the one I pulled out, shorter actually, but no idea if it was OEM.

 

Apologies, still wasn't able to get a good pic. It's either too bright outside and washes the whole thing out, or dark enough my phone won't focus. My DSLR is down for the count, as the result of a late-night photo shoot in the fog a couple weeks ago :/

I think I figured it out though, please correct me if this routing is incorrect. I *believe* the harness coming from the front comes along the top of the tranny and drops off the passenger side near the O2 sensor bung (this much I'm 99.99% certain is correct) then runs across the frame crossmember, under the exhaust, where it meets up with the sensor harness, which clips into a plastic clip on the frame. I had earlier had them connected on the passenger side of the exhaust, between the tranny and exhaust, which left a ton of extra wire, but running it across the crossmember and connecting them on the driver's side of the exhaust burns up about 99% of the wire I have available, and there are clips along the way to retain everything, as well as the truck's harness being wrapped in foil heat-protective tape where it runs under the pipe.