O2 Sensor Harness? (1 Viewer)

Joined
Aug 10, 2004
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Queens, NYC and sometimes Orlando, FL
Threw a few O2 codes and found a broken wire on the harness side of the upstream O2 (see pix)

Now, I figure I can just solder in a new pigtail, but after searching for one, I'm curious as to where exactly the harness actually terminates and if it may be available separately like this universal one (see pic)

While crawling underneath, I traced the loomed cable to somewhere above the transmission, but couldn't tell if/where it plugs in on top

I'd prefer to change the whole thing with an OEM harness if it's available as a plug and play and not too expensive

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Curtice

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Issaquah, WA
I'm going through this right now (1992 3FE). I have my whole harness apart. Unfortunately, I don't think it would be that easy. One of the O2 sensors has wires that run directly to the ECU...no plug, its just part of the main engine loom. The other sensor does the same thing, but goes through the cowl harness first and is part of some large 24 pin connectors. Hopefully that makes sense. If you have a 1FZ engine, not sure if it is the same but I would assume it is similar. Here is a picture...i'm holding the o2 sensor connector and you can see the wires just go into the main loom:

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The other thing to keep in mind is one of the wires to the O2 sensor is shielded (ground wire inside a sheath). So cutting and soldering that I'm not sure about.
 
Joined
Aug 10, 2004
Messages
4,821
Location
Queens, NYC and sometimes Orlando, FL
Yeah, by whole thing I didn't mean whole thing lol

I figured if it was available separately like the 3 way pigtail above I'd go that route, but looks like I'll be splicing in a plug.

Question:

Is there an actual connector difference between the upstream and the downstream?

The ones I've seen on most sites look the same visually, but some sites have them listed separately as B1 or B2
 

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