02 sensors - JeepForum.com
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post #1 of 25 Old 07-04-2020, 07:06 PM Thread Starter
xjpete
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02 sensors

2001 WJ 4.0 before anyone says which codes I'm not getting any,but the 02 sensors- any what range should they be replaced? I don't want someone to say- replace when your check engine light come on. I have 131,000 miles and based on the previous owners lack of maintenance they did on the Jeep,I'm thinking they were never replaced. They might be factory installed. So what range?-I know these things don't last forever.


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post #2 of 25 Old 07-04-2020, 09:12 PM
DJCantonGA
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I'm not sure about the life expectancy of an O2 sensor, but I know they can cause issues without setting a code. I've heard 100K, maybe someone will chime in soon with more info.

I replaced mine right after I got it. Had 225K miles, no proof they had been changed. Mileage improved and she ran much better.

Only buy Mopar sensors. @Kolak can hook you up if you need to replace them.
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post #3 of 25 Old 07-04-2020, 09:14 PM
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`o2 sensors are messengers, you do not replace them just because you see a code - You overheat you dont change the temp sensor.

How is your jeep running?
You would be in the ball park as 100k is a good live expectancy. Others will say 150k just a professional judgement call, but 20yrs seams enough.

You will want to use NTK sensors.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 25 Old 07-05-2020, 12:03 AM
speednjay
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I’ve always been told to replace them every 60k miles. I’ve had them go bad and not trip a code ( typically the downstream sensor) and usually you’ll get very very very bad gas mileage. Keep the o2 sensors fresh because they can destroy a catalytic converter
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post #5 of 25 Old 07-05-2020, 06:24 AM
Waterluvr
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I see lots of high mile Jeeps with 150K plus on the original sensors still running with no codes or stored pre-code history but they generally run and perform poorly.

Changing them generally yields some positive results with noticeably better performance.

Use Denso or NTK when replacing them, try and avoid Bosch on the older models that run a pci bus communication line such as the WJ they don't play well with the pcm.
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post #6 of 25 Old 07-05-2020, 08:10 AM Thread Starter
xjpete
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Yes my mileage is not what it was (16.5+) last summer. Currently getting 15.5 at best. I don't run A/C and this vehicle is maintained regularly. Will get some sensors this week.

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post #7 of 25 Old 07-05-2020, 06:46 PM Thread Starter
xjpete
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So looking at auto parts stores for the NTK sensors,I need 2 correct? I have the 02 socket so I might do this myself. Easy job with the right tools? yes or no?

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post #8 of 25 Old 07-05-2020, 07:55 PM
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I've never had much luck using a socket on removing them. I spray/soak them with pbBlaster for a couple days and then put a pipe wrench on them beating the handle of the wrench with a hammer going between loosening and tightening until it breaks free. If you have a torch to heat the bung up, even better (just dont burn stuff lol). I haven't done one on a jeep, so I cant say for sure how well getting a pipe wrench up in there works.
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post #9 of 25 Old 07-05-2020, 08:02 PM
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^
This is a later resort of course, I would try the socket first. You might now have rust issues like I deal with.
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post #10 of 25 Old 07-06-2020, 07:21 AM
jtpeters
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Advance Auto has a great 02 Sensor Removal loaner kit which makes this job a breeze.
The sockets (a variety of 3) are extremely heavy duty and will not open up (e.g. spread) not matter how tight the 02 sensor.
I just went ahead and purchased it and use it for other applications as well.
Highly recommended.

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post #11 of 25 Old 07-06-2020, 08:04 AM Thread Starter
xjpete
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I have a heavy duty 02 sensor socket that is 3/8" and looks almost like an impact socket.

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post #12 of 25 Old 07-06-2020, 08:04 AM
DJCantonGA
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Quote:
Originally Posted by xjpete View Post
So looking at auto parts stores for the NTK sensors,I need 2 correct? I have the 02 socket so I might do this myself. Easy job with the right tools? yes or no?
I have CA emissions on my '04, so I have 4 (2 upstream, 2 downstream).

Pretty easy job. The upstream sensors require a some reaching, but nothing too difficult. I bought the sensor socket from Harbor Freight.

Look up the NTK sensors on Amazon and compare prices.

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post #13 of 25 Old 07-06-2020, 01:19 PM
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While my 04 4.7 has Federal & 50 state emissions it still has 2 upstream and 2 downstream oxygen sensors.

The sticker under my hood says Federal as well as the info/sales codes on my build sheet as seen below.

NAS 50 State Emissions
NBGP Federal Tier 2, Bin 9A Emissions

On all our other present/past Jeeps (all 4.0) I used NTK o2 sensors with same part numbers as the OE sensors.

But when I bought my 04 4.7 WJ 8 years ago it had Denso o2 sensors in it so that's what I replaced them with. About half the price as NTK and I always heard some of the OE brands were Denso or NTK.

I always have had problems with the smell of non-burnt fuel on start up but don't think this has to do with the Denso o2 sensors. Could be leaking injectors or something like that and I have new Mopar TPS and IAC sensors. My mpg average is 18 so the o2 sensors must be working have descent.

On the deep-well 6-pt oxygen sensor socket I have the first thing I had to do was file down the sharp edges on the wire slot edges so it doesn't cut wires. But I still don't like to use it to install new o2 sensors.

2004 4.7L WJ Limited, 96 4.0 ZJ


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post #14 of 25 Old 07-07-2020, 06:49 AM
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All the pcm software 2001 and newer are flashed for 2 up and 2 down regardless of emissions classification, prior years that weren't California models ran 1 up and 1 down.
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post #15 of 25 Old 07-07-2020, 01:29 PM
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Interesting Waterluvr and thanks for the info.

The below info for oxygen sensors and exhausts from wjjeeps is incorrect for my Fed emissions 04 4.7. As already mentioned I have 2 upstream and 2 downstream oxygen sensors when it isn't CA emissions. Those 4 o2 sensors are before/after each small cat (2) under the engine and they're showing those small cats only for CA emissions.

http://wjjeeps.com/oxygen.htm

Plus my OE exhaust never had a cat in front of the muffler as shown in the below diagram for Fed emissions and there was just a large muffler.

I believe wjjeeps gets a lot of their info/diagrams from the FSM and official parts manuals. Jeep/Chrysler never was big on keeping their FSM's updated from year-to-year and most often just used the same info as the previous years.

The below diagram from wjjeeps is the exact same one in my 04 FSM (p.14-40) which wasn't ever updated showing 2 small cats on the Federal emissions 4.7. Oh well, what you physically see is what you get!

BTW, the torque spec for oxygen sensors is 22 ft.lbs in case anybody can squeeze a torque wrench up in there. I just tighten them until they feel right and use the copper non-seize on the threads if it comes with them.

Below is the diagram mentioned before from wjjeeps and from the 04 FSM (p.14-40) which isn't correct for my Fed emissions 04 4.7. Since xjpete who started this thread has the 01 4.0 I might as well throw in the image for oxygen sensor locations on the 4.0 too.
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2004 4.7L WJ Limited, 96 4.0 ZJ


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