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Unread 03-07-2003, 10:38 AM   #1
automan25
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Join Date: Dec 2002
Location: Kenmore, WA
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Oxygen Sensors

How often should the oxygen sensors be replaced on my Jeep? I heard that the standard is every 100,000 miles.

What sort of performance results have any of you incurred when changing out your oxygen sensors?

And Lastly...how many sensors are there? Two? One in front and one behind the catalitic converter?

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1993 ZJ Limited 5.2 - no mods - Red with Gold (what were they thinking) trim.
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Unread 03-07-2003, 10:43 AM   #2
Black96ZJ
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Join Date: Dec 2002
Location: Alpharetta, GA
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O2 sensor

I replaced mine at 90,000 because the service code for it came up on the check engine light. Since replacing these, I have seen an increase in gas-mileage and thats about all. I believe that there is only one on urs, i could be wrong but get a haynes manual for it and it will tell you. Hope this helps

Last edited by Black96ZJ; 03-07-2003 at 10:48 AM..
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Unread 03-10-2003, 01:40 PM   #3
97RedBird
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There is one just at the exhaust manifold under the hood, and another just after the catalytic converter. One to test before and one after the cat. That way the PCM can detect failed Cat's. I replaced my cat this weekend, but I may change the sensor, because the gas mileage didn't go up enough. I'm hoping to hit 19 to 20 mpg again. I'm currently at 15-17 mpg.
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Unread 03-10-2003, 07:24 PM   #4
ZR7 Ken
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Automan,

Your '93 has only one O2 sensor, on the front pipe (near the trans pan). It's definitely not a bad idea to change it, since they do wear from the hot/cold cycles and get carboned up. Just a warning, though. Yours isn't fun to replace. The connector is clipped to a harness that runs along the trans dipstick tube. Getting your arm up to it is a real pain in the a$$. You absolutely dont want to try it when it's been running.
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Unread 03-10-2003, 11:36 PM   #5
automan25
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Are there any special tools required for the job? Any secrets I should know?
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Unread 03-11-2003, 08:35 AM   #6
Black96ZJ
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There should be no extra tools needed, other than a 7/8 inch wrench and/or 7/8 inch socket, driver, and extensions.
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Unread 03-11-2003, 09:29 PM   #7
automan25
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Thanks, I may do it this weekend. I'll let you know how it goes.
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Unread 03-15-2003, 06:00 PM   #8
automan25
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boy, you were right. The O2 sensor itself is very easy to replace, it's connecting it up to the wiring harness that's the tough part. I crawled underneath my Jeep to do this job and found that there was no way I could reach up above the transmission to access the plug. It does look like it's accessible from above if I were to remove the center console, and the shifter bezel. Do you know how to do this?
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