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Unread 01-15-2010, 07:44 PM   #1
Rushkiboy
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2004 WJ 
 
Join Date: Oct 2009
Location: South River, NJ
Posts: 27
Replacing O2 sensor in '04

Whats the best way to change out the O2 sensor (Bank 1,Sensor 1) in an 2004 Grand Cherokee 4.0L 4X4? Code PO135. Its the one up top towards the front of the Jeep. No easy way of getting to it from top or bottom. Looks like maybe taking off the air filter box might give me some room. The wire connection is right there but you cant see the sensor looking down into the engine bay its tucked underneath. Not much room from bottom either. How did you guys do it? Thanks this sites been a life saver. Thanks again! I'm all ears.

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Unread 01-15-2010, 07:48 PM   #2
TrdLtly
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Posts: 66
See if this helps:Jeep Grand Cherokee WJ - Oxygen sensors (02S)
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Unread 01-15-2010, 08:26 PM   #3
Rushkiboy
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Thanks checking it out now.
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Unread 01-16-2010, 09:23 AM   #4
Rushkiboy
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Not really a "how too" more like an explanation of what it is and does. Looking for some experienced people who did it. Any tid bits, advise? Thanks.
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Unread 01-16-2010, 01:42 PM   #5
TrdLtly
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Join Date: May 2009
Location: Dubuque, IA
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It is exactly a "how to", but not a tips or suggestions. (cut and paste from page)
02S Sensor removal Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.
1. Raise and support vehicle.
2. Disconnect O2S pigtail harness from main wiring harness.
3. If equipped, disconnect sensor wire harness mounting clips from engine or body.
CAUTION: When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.
4. Remove O2S sensor with an oxygen sensor removal and installation tool.
02S Sensor installation
Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.
1. Install O2S sensor. Tighten to 22 ft. lbs. (30 Nm) torque.
2. Connect O2S sensor wire connector to main wiring harness.
3. If equipped, connect sensor wire harness mounting clips to engine or body. When Equipped: The O2S pigtail harness must be clipped and/or bolted back to their original positions on engine or body to prevent mechanical damage to wiring.
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SOLD----- 2004 Onyx Green Pearl JGC (WJ) Laredo - 4.0L - SelecTrac - 2" BB - Gal 1:6-9, Mk 13:22-23
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