There are 3 o2 sensors on my 1997 SC. One of them is currently not plugged in and my questions are the following:

1.) Is is absolutely necessary to have the 3rd o2 sensor plugged in, or can I run without it? If I can run without, please give me pointers.

2.) If I do need to have it, My problem is that after replacement of the flange on my new exhaust, the wire no longer reaches where it needs to plug in. My question is, How would YOU recommend I go about extending the wiring?? Below are 2 photos of the o2 sensor and the plug it has. Any advice is greatly appreciated. Thanks in advance.




P.S. Im NA-T incase that makes a difference in what advice you may give me.

Ashtray-

edit: Also, whats the difference between the threaded o2 sensors and the ones that have a flange with 2 bolts? I have 2 extra threaded o2 sensors and I was wondering if I could use that wiring as an extension. Thanks again.

 

also does anyone know where it even connects. I cant find the plug to save my life.

 

Is it a pre (bank 1) or post (bank 2) O2? Are you using a MAP of MAF system on your NA-T set up?

 

if it's short you can buy an extension. at jegs.com or capers.com they are the same place i called them a few days ago to get an extension made.you can have them make it whatever lenght you need.hope that works for you.

 

Im not sure if its pre or post or 1 or 2. It is housed in the midpipe. Im currently MAF and on blowthrew but in 2 weeks ill be in drawthrew.

Thanks man that helps tons. Do you know where it plugs in? I checked all over the damn ECU and that little comp next to it along with all those ribbon wire females or males im not even sure, on the right side. Help me out on where it plugs in

Thanks guys for helping me out.

 

no, right now your draw through (maf infront of turbo), on the 6th we will be switching you to blow through (maf after turbo, before TB)..

and just to clarify, this is the 3rd o2 sensor post cat just behind the flange on the mid-pipe. It came up somewhere through the pass floor board

 

Thanks for clearing up that, I get those 2 confused, blow and draw..Anywho, yea, it comes up through the floor board but god help me if I cant find that damn plug it goes to. I found the extensions on Jegs... not sure which one to get.

 

dont order anything yet, just hold off till the 6th and we will handle it then..no need to spend money on something that isnt needed yet..you still have those other o2 sensors right?

 

yea i still have those. BTW, my car is running hella lean..idk what happened but I tried taking it for a spin and i got a bunch of crappy noise from the motor so i rolled it back to my house.

 

nevermind, found the plug and got his car tuned..

 

sorry to bring an old thread back, but i have the similar questions. does this 3rd o2 sensor needed for a NA-T and what did you guys end up doing with it?