"upstream" o2 sensor?

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Jul 28, 2012 | 06:09 PM

Bruce in Montana

Thread Starter

Member

Joined: May 2012

Posts: 132

Likes: 0

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....

Jul 28, 2012 | 08:05 PM

jrh97007

Junior Member

Joined: Jul 2010

Posts: 68

Likes: 0

From: Beaverton

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.

Jul 28, 2012 | 08:11 PM

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Here it is.

Attached Thumbnails

Jul 28, 2012 | 08:23 PM

88_cherokee

Member

Joined: Jun 2012

Posts: 224

Likes: 0

From: Trujillo Alto Puerto Rico

Year: 88

Model: Cherokee

Engine: I6

upstream is the first, downstream is the second

Jul 28, 2012 | 08:48 PM

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,841

Likes: 117

From: In the middle of Minnesota!

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.