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Old 05-11-2010, 01:50 PM
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Oxygen Sensor Info

My 2002 had a bad O2 sensor about 8months ago. I changed it out while I was home last time. Now when the wife took it to be inspected she was told the reason the Check Engine light is on is the O2 sensor is bad again. I realize there are several on the Jeep, and am not sure if it is the same one I changed.Just curious how long do these usually last on the 4.0 motor. I have about 130-135k on the clock.

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Old 05-12-2010, 05:26 PM   #2
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Unless your Jeep is from California, you should only have two O2 sensors. I am going to assume you replaced the upstream one (This is the one that usually goes bad first). The downstream one is near the catalytic converter (I had to remove my skid plate to get to it, some people say this is not necessary but it helped). In answer to your question, O2 sensors should last a really, really long time (Mine didn't go out until around 140K). So I would check the one you have not swapped out.

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Old 05-12-2010, 05:41 PM   #3
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I believe most states import the 50-state compliant Calif. version TJ which likely by 2002 had four 02 sensors. Two upstream and two downstream.
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Old 05-12-2010, 05:49 PM   #4
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Quote:
Originally Posted by Jerry Bransford View Post
I believe most states import the 50-state compliant Calif. version TJ which likely by 2002 had four 02 sensors. Two upstream and two downstream.
Wait, you have a 2002, mine is 1999. Jerry is right.

Check out this link, 1999-2000 California Jeep 4.0L O2 Oxygen Sensor, it shows you where all four of the O2 sensors are for your Jeep. Unless you have already done it, check both of your upstream sensors.
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Old 05-12-2010, 09:12 PM   #5
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Where did she take it? Have them tell her which O2 is bad.
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Old 05-12-2010, 10:09 PM   #6
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Turn the ignition key on-off-on three times within 5 seconds and then leave it on, then wait (several seconds) for the diagnostic code(s) to be displayed in the odometer. That code will indicate which 02 sensor it is.
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Old 05-13-2010, 12:47 AM
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Quote:
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I believe most states import the 50-state compliant Calif. version TJ which likely by 2002 had four 02 sensors. Two upstream and two downstream.
Yeah it has 4, I replaced the one in the exhaust header closest to the front of then engine. Bank 1 I think they call it. Oh Well 3 left I guess I will have her try the ignition switch code read
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Old 12-04-2011, 10:00 AM   #8
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P 0138 is the code that came up, when switching the ignition on & off three time, where do I look up this code to find out which sensor is bad?
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Old 12-04-2011, 10:59 AM   #9
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My 02 has four also, changed the bank 1 sensor with a universal one and I still have the same P0138 code. I'm wondering if anyone else is having the same problem.
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Old 12-04-2011, 11:42 AM   #10
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P0138- O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

This is the DOWNSTREAM O2 sensor on Cylinders 1,2,3..... REAR of the cat on the FRONT downpipe.

FYI...

Cylinders 1,2,3= BANK 1
Cylinders 4,5,6= BANK 2

(4) O2 sensors total:

BANK 1 UPSTREAM (in manifold)
BANK 1 DOWNSTREAM (rear of cat on front downpipe)
BANK 2 UPSTREAM (in manifold)
BANK 2 DOWNSTREAM (rear of cat on rear downpipe)
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Old 12-04-2011, 01:28 PM   #11
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The cheapie sensors either don't work right or don't last long. Universal sensors seldom do the job.

Do it right, get t from the dealer - the slight extra cost sure beats replacing it every year, so it's cheaper in the long run..
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Old 03-14-2013, 05:06 PM   #12
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which o2 sensor brings up engine code 0135 on a 2002 jeep wrangler 4.0 engine

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