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Old 01-28-2014, 08:03 AM   #1
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O2 Sensor Help

I am currently in the process of changing my O2 sensors. I hooked up the computer and red that the O2 sensors are bad.

I got 3 new O2 sensors but I don't know where the O2 sensors are located.
I know there are 2 O2 sensors for the exhaust. One upstream and one downstream. Also "cali" jeeps (California) have 4 O2 sensors due to emissions. As far as I know my jeep is not a "cali" jeep.

Like I said I just need to know the locations of the O2 sensors and also any advice on how to change them easily.

-Kokonutb
2001 Jeep Wrangler Sahara Edition 4.0l 6cyl manual

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Old 01-28-2014, 08:07 AM   #2
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Should have only two if you're not driving thru Cali. One past the exhaust manifold/collector and one past the cat. What brand sensors did you get? I highly recommend NGK/NTK

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Old 01-28-2014, 08:46 AM   #3
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I'm not sure when they changed to 4 on all wranglers but my '99 had two, my '06 has 4. Anyhow, if you have 2 the upstream is at the exhaust just below the steering area driver's side at the exhaust, the plug is above by the steering shaft area. The downstream is back by the rear axle in the exhaust on the passenger side. I used an o2 sensor socket ($3 at harbor freight if you want a cheap one) but you can get them with wrenches too. Unplug, unscrew, replace. I followed the torque specs myself. Be sure to use the right one for the location.
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Old 01-28-2014, 09:16 AM   #4
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I've got an 01' and I'm wondering if changing mine will help improve my fuel mileage. I currently do 14.5 at best. Looking to get up to 15. It's not throwing any codes or running bad. Just curious
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