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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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