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o2 sensor

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Old 11-25-2011 | 05:38 PM
  #1  
KnoxJeep's Avatar
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From: Knoxville
Year: 1999
Model: Cherokee
Engine: 4.0
Default o2 sensor

I need to replace my upstream o 2 sensor is there only 1 on a 99 4.0?
Old 11-25-2011 | 06:46 PM
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ET JEEP's Avatar
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From: East Texas
Year: 1997
Model: Grand Cherokee
Engine: 4.0
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Looking at a wiring diagram for your year/model it shows an upstream and a downstream oxygen sensor.
Old 11-25-2011 | 11:09 PM
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Year: 1999
Model: Cherokee
Engine: 4.0
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My 99 with the 4.0L has two O2 sensors.
Old 11-26-2011 | 02:02 AM
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From: knoxville, tn
Year: 2000
Model: Cherokee
Engine: 98 4.0 I6
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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; 11-26-2011 at 02:06 AM.
Old 11-26-2011 | 02:11 AM
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From: knoxville, tn
Year: 2000
Model: Cherokee
Engine: 98 4.0 I6
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http://m904.photobucket.com/albumvie....jpg.html?o=38

2 pre mini cat sensors on this from 2000
Old 11-26-2011 | 02:46 AM
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From: Middlesex, New Jersey
Year: 1996
Model: Cherokee
Engine: 1998 4.0L Inline 6
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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)
Old 11-27-2011 | 08:22 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
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Thanks guys. I'll ne replacing this weekend !
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