o2 sensor wiring

[Tyler16]

So my left o2 sensor wouldnt work so i swaped the harness on each senser and it still says left side lean. So I have a wiring problem. I can trace the red/black wire all the way to the computer. But I have no idea where the power, ground, and the vref run to. Can anybody help?

 

[BlownFiveLiter]

You don't necessarily have a wiring issue, you could actually be lean. Do you have any codes?

 

[HISSIN50]

And did you check the output signal for the O2? That can help you deduce if the power and grounds to the sensor are ok.

Did you swap the O2's from one side to the other to see if the code followed the sensor?

 

[revhead347]

More importantly, did you reset the computer after you swapped the sensors. It's going to remember codes if you don't reset the computer.

Kurt

 

[Tyler16]

so I think I know my problem. I have a 02 harness from a 3.8 that I had found in a junkyard thinking they were the same harness. Well the plugs all hookup the same but the wiring is different. I cant find anywhere of a diagram of how to make this o2 harness or anywhere to even buy one.

Iv found some diagrams on veryuseful.com but it shows the hego plug for a 94 but the other diagram is for a 93 which is also different. I need the plug diagram that goes to the engine harness.

 

[BlownFiveLiter]

I found the O2 sensor harness on Autozone's website recently, so I know it should be on there. I'd try to find it again now, but the site is blocked at my work.

 

[Tyler16]

ill check their site as well. If not if all possible somebody can draw up a diagram of how its wired?