Quick O2 sensor question

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Feb 9, 2009 | 02:46 PM

91 Laredo

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Seasoned Member

Joined: Jan 2009

Posts: 293

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Year: 1994

Model: Cherokee

Quick O2 sensor question

I was looking through the invoices that came with my Jeep and didnt see any for an o2 sensor. Its a 94 w/ 145k.

If its not throwing any codes how do I know if it needs replaced? Would there be any benefit to just go ahead and replace it? I think there are two, which one is more important?

Jeep runs pretty good, sometimes idles a little rough. Already did all the other tune up items.

Feb 9, 2009 | 03:10 PM

okcjeeper

::CF Administrator::

Joined: May 2008

Posts: 10,039

Likes: 16

From: Okc area

Year: 1991

Model: Cherokee

Engine: 4.0 I6

Your 91 should only have 1 sensor. It is in the down pipe/S pipe just below the header..
What codes is it throwing?

Feb 10, 2009 | 02:04 AM

91 Laredo

Thread Starter

Seasoned Member

Joined: Jan 2009

Posts: 293

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Year: 1994

Model: Cherokee

Quote:

Originally Posted by okcjeeper

Your 91 should only have 1 sensor. It is in the down pipe/S pipe just below the header..
What codes is it throwing?

Its a 94 (I should change my screen name to avoid some confusion).

Its not throwing codes, didnt know if it would be any sort of benefit to just replace it as its original.

Feb 10, 2009 | 07:27 AM

okcjeeper

::CF Administrator::

Joined: May 2008

Posts: 10,039

Likes: 16

From: Okc area

Year: 1991

Model: Cherokee

Engine: 4.0 I6

Quote:

Originally Posted by 91 Laredo

Its a 94 (I should change my screen name to avoid some confusion).

Its not throwing codes, didnt know if it would be any sort of benefit to just replace it as its original.

Actually if you update your profile you can add in your jeep info..

That would stop all confusion....

If it's not broke and not throwing codes no point in replacing it. Not sure what year they went to ODBII and added the second O2 sensor but I don't think my buddies 94 has more then 1 sensor. The second would be after the cat converter.