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Old 03-17-2015, 10:58 PM
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Join Date: Jul 2012
Posts: 4
02 Sensors

Swapping out the 02 sensors on my 2000 Jeep 4.0 Sport, when I checked earlier I could only locate two sensors. Can anyone else confirm there are only two or does it vary?

Before cat (upstream?)

Between cat and muffler (downstream?)

These have been replaced before with Bosch but are failing again, noticing terrible MPG. I want to swap them out with NGK and are uncertain of what part # to go with.

Am I correct to assume before cat is considered upstream, and between cat and muffler downstream?

Thanks in advance.

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Old 03-18-2015, 10:30 AM   #2
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Location: Pompano Beach, FL
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You are correct on the upstream and downstream designation.

From what I see on our site at a glance, there is only 2 -
Sensors for Jeep Wrangler TJ & Unlimited TJL

(front and back) if that helps :-)




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Old 03-18-2015, 10:43 AM
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Cool thanks, I ordered NGK 23099 and NGK 23122.
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