How many oxygen sensors does a 1991 California XJ have

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Dec 1, 2021 | 04:24 PM

evil_goat

Thread Starter

Seasoned Member

Joined: Jan 2021

Posts: 324

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From: North North California

Year: 1992 with 260k miles

Model: Cherokee (XJ)

Engine: 4.0 Inline 6

How many oxygen sensors does a 1991 California XJ have

My Xj is from 1991, and it says it's approved for California. How many oxygen sensors does it have, and which one(s) should I get?

Dec 1, 2021 | 04:39 PM

Ralph77

CF Veteran

Joined: Oct 2015

Posts: 7,517

Likes: 1,626

Year: 2000

Model: Cherokee (XJ)

Well I got curious and best I can tell only one.
Part number in my '91 to '93 parts catalog is 56005925.
No mention of CA Emissions.
Says with a 18" pigtail. Looks like the same one for YJ's and MJ's too.
At Napa that number crosses to the NTK 23023.
If it were me that is what I would buy.
Oh and it is listed as Upstream; Bank 1 Sensor 1 in the description at Napa.

Dec 1, 2021 | 06:23 PM

Saudade

CF Veteran

Joined: Aug 2020

Posts: 2,125

Likes: 578

From: SoCal

Year: 1988

Model: Cherokee (XJ)

Engine: 4.0L

Yep, only 1. It started in 1994 with a few vehicles but in 1996 OBDII came about. All vehicles 1996 and after have upstream (before the CAT) and downstream (after the CAT).