o2 sensor

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Nov 25, 2011 | 04:38 PM

KnoxJeep

Thread Starter

Junior Member

Joined: May 2010

Posts: 91

Likes: 0

From: Knoxville

Year: 1999

Model: Cherokee

Engine: 4.0

o2 sensor

I need to replace my upstream o 2 sensor is there only 1 on a 99 4.0?

Nov 25, 2011 | 05:46 PM

ET JEEP

Seasoned Member

Joined: Sep 2009

Posts: 454

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From: East Texas

Year: 1997

Model: Grand Cherokee

Engine: 4.0

Looking at a wiring diagram for your year/model it shows an upstream and a downstream oxygen sensor.

Nov 25, 2011 | 10:09 PM

jeep3200

Member

Joined: Apr 2010

Posts: 158

Likes: 0

Year: 1999

Model: Cherokee

Engine: 4.0

My 99 with the 4.0L has two O2 sensors.

Nov 26, 2011 | 01:02 AM

jomps

CF Veteran

Joined: Apr 2010

Posts: 3,966

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From: knoxville, tn

Year: 2000

Model: Cherokee

Engine: 98 4.0 I6

I think it also depends on cali emissions but not sure when that went into production...my 2000 had more than my 98

Last edited by jomps; Nov 26, 2011 at 01:06 AM.

Nov 26, 2011 | 01:11 AM

jomps

CF Veteran

Joined: Apr 2010

Posts: 3,966

Likes: 0

From: knoxville, tn

Year: 2000

Model: Cherokee

Engine: 98 4.0 I6

http://m904.photobucket.com/albumvie....jpg.html?o=38

2 pre mini cat sensors on this from 2000

Nov 26, 2011 | 01:46 AM

Gizmo52

Member

Joined: Mar 2011

Posts: 229

Likes: 1

From: Middlesex, New Jersey

Year: 1996

Model: Cherokee

Engine: 1998 4.0L Inline 6

you should have 2... if its a stright 6 there should be one on the exhaust pipe relitively close to the headders (upstream)... the other should be near or on the cat (downstream)

Nov 27, 2011 | 07:22 AM

KnoxJeep

Thread Starter

Junior Member

Joined: May 2010

Posts: 91

Likes: 0

From: Knoxville

Year: 1999

Model: Cherokee

Engine: 4.0

Thanks guys. I'll ne replacing this weekend !

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