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Missing O2 Sensor Connector - Chasing it down

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Old 06-23-2013, 01:07 PM
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Default Missing O2 Sensor Connector - Chasing it down

Hey all, got a rather strange issue. A bit ago some of you may remember I posted in another thread I was missing my front o2 sensor connector. Well I was gonna leave it til my mechanic could look at it, but I need to be able to run it while it sits and I dont want to kill my new cat already. I dont mean the o2 sensor itself, its there. I Mean the connector it plugs into! Ive searched high and low but cant find the thing anywhere. Its not there. Talking to my buddy who helped me put my high flow cat on, he didnt remember it being attached then either. It confuses me cause if thats the case I should never have passed the e-test I put it through, and shouldnt it run awful without a front o2? Anyways Ive decided to try to chase it down. The wires should be coming from the PCM correct? Does anyone know specifically what wires it is coming out of the PCM? I would assume the wires should be the same color as near the connector?

edit: currently have p0135 and p0132 for codes being thrown.
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Last edited by Johnn123; 06-23-2013 at 01:46 PM..
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Old 06-23-2013, 01:42 PM
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the truck will run ok with no O2 sensor attached, but it should immediately set a CEL code/light (13x series O2 circuit). the truck will run from its default settings which might be a tad rich, but will run normal.

look for the O2 connectors on top of the transmission. one near the front, one near the rear.
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Last edited by dhvaughan; 06-23-2013 at 01:53 PM..
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Old 06-23-2013, 01:44 PM
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Originally Posted by dhvaughan View Post
the truck will run ok with no O2 sensor attached, but it should immediately set a CEL code/light. the truck will run from its default settings which might be a tad rich, but will run normal.

look for the O2 connectors on top of the transmission. one near the front, one near the rear.
I have p0135 and p0132 for codes. I searched the top of the transmission, there is no connector there.
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Old 06-23-2013, 01:52 PM
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look in the transmission wiring harness. connector is normally attached to frame or body piece with a clip.
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Old 06-23-2013, 02:10 PM
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I found this:
Click the image to open in full size.

Its not the same as the end on my sensor though? Theres nothing else there. This is on the drivers side near the linkage to the shifter.
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Old 06-23-2013, 02:21 PM
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That should be it, shape is right, but, the wire colors don't look right.....
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Old 06-23-2013, 02:27 PM
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Its circular though? Shouldnt it be squarish? Its got prongs on the inside as well if that makes any difference.
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Old 06-23-2013, 02:30 PM
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I see tan and white wire there so that's the 02 plug. So you need the right 02 in the exhaust system thats all.

Edit: Or is it white and tan hmmm what's the drivers side plug look like?
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Old 06-23-2013, 02:33 PM
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i think i know what happened. you ordered a ntk 23139 and you need a ntk 23506. i guess your truck is built to California emissions standards. do you still have your old o2 sensor kicking around?
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Old 06-23-2013, 02:41 PM
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@merc: should there be more then one pre-cat sensor? i thought there was only the one? that photo was taken from the drivers side?

@cw: if it makes any difference, my truck was made in mexico, though i find it odd cause im in ontario canada though! is there a way to check what emissions standard it was built to? and no i dont dad threw them away thinking i didnt need them anymore
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Old 06-23-2013, 03:09 PM
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ON the emissions label under the hood, should say cali,or fed emissions.

Wire colors I got for front O2: (from the manual)
Dark Green/White
Brown/White
Black/Light Blue
Tan/White <- this one indicates upstream O2.

First three are the same.
Orange/Black <- this one is post cat.

Cali emission connectors are square-ish..... fed emissions are round. You have a fed emission truck, so, prolly wrong O2 sensor.
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Old 06-23-2013, 03:13 PM
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there are 2 shapes for the O2 sensors - round and square. i looked at every internet site i could find before ordering one, and it still turned out to be the wrong one. i don't remember which shape my 01 is.

single exhaust federal emissions for 01 (with Y pipe) had one precat and one post cat.
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Old 06-23-2013, 03:18 PM
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Quote:
Originally Posted by HeyYou View Post
ON the emissions label under the hood, should say cali,or fed emissions.

Wire colors I got for front O2: (from the manual)
Dark Green/White
Brown/White
Black/Light Blue
Tan/White <- this one indicates upstream O2.

First three are the same.
Orange/Black <- this one is post cat.

Cali emission connectors are square-ish..... fed emissions are round. You have a fed emission truck, so, prolly wrong O2 sensor.
That must be it. Im going to try the NTK 23506, it appears to have the right connection, or so the pics look like.

Quote:
Originally Posted by dhvaughan View Post
there are 2 shapes for the O2 sensors - round and square. i looked at every internet site i could find before ordering one, and it still turned out to be the wrong one. i don't remember which shape my 01 is.

single exhaust federal emissions for 01 (with Y pipe) had one precat and one post cat.
Ok thats what I thought, thank you!

Thanks guys, ill pick up the sensor tomorrow and see how it works.
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Old 06-24-2013, 06:44 PM
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Went to Canadian tire to get the sensor, ughh that was a waste of time. Asked for an NTK 23506, he told me it didnt exist. So I asked for what theyre computer said was the proper sensor. Wrong sensor, had the square end on it. I showed him the pic of my connection but I dont think it registered that was circular instead of square lol. Oh well off to NAPA tomorrow.
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Old 06-24-2013, 06:47 PM
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you know you could order it from rock auto and it would be cheaper than buying it locally?
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Old 06-24-2013, 06:51 PM
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Originally Posted by crazzywolfie View Post
you know you could order it from rock auto and it would be cheaper than buying it locally?
I would normally order from Rock Auto but I wanna be sure I get the right part, and shipping back if it seems like a pain to me if it isn't. Besides gives me something to do in my boring days...
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Old 06-24-2013, 06:57 PM
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go back to canadian tire and get them to look up 123-1651-2. $76.99 plus tax. should be what you need.
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Old 06-24-2013, 07:04 PM
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do they ask you if it is a standard or automatic when you are at the store? only reason i ask is because i found the sensor on there website when i answered "NO" to 1. W/AUTO TRANS
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Old 06-24-2013, 07:06 PM
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Quote:
Originally Posted by crazzywolfie View Post
go back to canadian tire and get them to look up 123-1651-2. $76.99 plus tax. should be what you need.
I just called them and asked if they had that part number in stock and they said they didnt
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Old 06-24-2013, 07:15 PM
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did you ask if they can get it. i know usually if you order something by 11am it will be there by 5pm or at least that is the way it works here.

you know you can usually check to see if they have what you need in stock on there website. you just have to try tracking the stuff down.
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Old 06-24-2013, 07:15 PM
 
 
 
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