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How many oxygen sensors?

How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 2:17am

Can't really find a straight answer online, and when I look them up on Rockauto it almost seems like they are interchangeable. Anyone know for sure? Won't have my truck with me for another week and trying to gather some parts for a tune up.
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Re: How many oxygen sensors?

Postby ASTE25 » Mar 25 2012, 3:40am

The question is a bit vague. Are you asking how many sensors there are, or are you asking if they are all the same?
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Re: How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 3:43am

Had my buddy go out and look for me. He swears up and down there are only 2 upstream, one off each manifold, and none post-cat. He said there are two bungs but they are blocked off and look like it was done from the factory. He's done a couple different swaps and builds so I assume he's right. Does this seem right?! Everywhere I look online for parts lists 2 different part #'s, the 2 upstreams and 1 rear are the same, and then the other rear is different because of wire length.
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Re: How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 3:44am

Yeah, was asking how many total there are, or are supposed to be now is the question I guess haha.
Last edited by thedant on Mar 25 2012, 3:45am, edited 1 time in total.
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Re: How many oxygen sensors?

Postby ASTE25 » Mar 25 2012, 3:44am

Is your truck completely stock, or do you think someone may have modified it?
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Re: How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 3:48am

Completely stock until I got it. Intake, Nelson Tune, and single magnaflow muffler. He said the bungs were about 10" from where they cut the pipe to weld the muffler on. So I don't think the guy that put it on would have messed with it. He also said whatever they used to block the bungs off were equally as rusty as the exhaust tubing itself, so I doubt it was done recently.

Edit- Also not throwing any codes and had it scanned anyways just to make sure. All is clear. If there were 2 missing where they should be, shouldn't it be throwing a code?
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Re: How many oxygen sensors?

Postby ASTE25 » Mar 25 2012, 3:58am

I'll have to look at mine when I get home, but I'm thinking it's got two before and two after the cats. I know the ones I have put transmission in all had 4 (2 before and 2 after the cats).
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Re: How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 4:07am

Image

Image
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Re: How many oxygen sensors?

Postby ASTE25 » Mar 25 2012, 4:35am

definatly looks like someone plugged where they are supposed to go. I don't think those are factory pipes either, but I may be wrong.
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Re: How many oxygen sensors?

Postby thedant [OP] » Mar 25 2012, 4:38am

He said he looked around for a harness to plug them into and didn't find any? I don't know man, I'm pretty stumped. May call a dealership Monday and see if they have any insight.
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