"upstream" o2 sensor?

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07-28-2012, 06:09 PM

Bruce in Montana

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Year: 1997

Model: Cherokee

Engine: 4.0

"upstream" o2 sensor?

So...the wife took our DD (1997 Cherokee country) to our mechanic for a code reading....

He said the the "upstream" o2 sensor showed a problem.

Question:

Where the hell is the upstream sensor?

Thanks guys....

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07-28-2012, 08:05 PM

jrh97007

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Year: 1988

Model: Cherokee

Engine: 4.0

My 88's is right in the header on the driver side. Took all of about 10 min. to swap.

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07-28-2012, 08:11 PM

djb383

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Year: 1998

Model: Cherokee

Engine: 4.0L HO

Here it is.

Attached Thumbnails

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07-28-2012, 08:23 PM

88_cherokee

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Year: 88

Model: Cherokee

Engine: I6

upstream is the first, downstream is the second

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07-28-2012, 08:48 PM

tjwalker

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Year: 1999

Model: Cherokee

Engine: 4.0

I highly recommend NTK replacement sensors. Same as what is in your XJ.

Stay away from any no-name sensor or generic oxygen sensors. They are absolute CRAP.