The Official Jeep Wrangler TJ Oxygen (O2) Sensor Thread

Given that NGK / NTK O2 sensors are now being discontinued, I felt that it was time to update this thread. For a long time in the TJ community it was well known that NGK / NTK O2 sensors were the only ones that didn't have issues with reoccurring OBDII error codes. Fortunately it would appear that many others in this thread have found a solution. Walker O2 sensors have been widely reported to be trouble free with our TJ PCMs.

Because of all the good feedback I've been hearing about Walker O2 sensors, I'm going to update this thread below to include all of the Walker O2 sensors (as well as links) for each year and model of TJ. Thanks to all of you who have reported on the Walker O2 sensors for making this possible.

FWIW, Walker sensors are made in Japan. This is a very good thing and a big step above any of the crap quality Chinese sensors you'll find at Autozone and the likes.


4-Cylinder Engines

1997
-2000
250-24942 - Bank 1, Sensor 1 - OE Base Sensor
250-24943 - Bank 1, Sensor 2 - OE Base Sensor
350-34511 - Bank 1, Sensor 1 - OE Replacement
350-34439 - Bank 1, Sensor 2 - OE Replacement

2001-2004
250-24345 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
350-34320 - Bank 1, Sensor 1 - OE Replacement
350-34320 - Bank 1, Sensor 2 - OE Replacement

2005-2006
250-24253 - Bank 1, Sensor 1 - OE Base Sensor
250-24253 - Bank 1, Sensor 2 - OE Base Sensor
350-34039 - Bank 1, Sensor 1 - OE Replacement
350-34039 - Bank 1, Sensor 2 - OE Replacement


6-Cylinder Engines

1997
-2000
250-24942 - Bank 1, Sensor 1 - OE Base Sensor
250-24943 - Bank 1, Sensor 2 - OE Base Sensor
350-34511 - Bank 1, Sensor 1 - OE Replacement
350-34439 - Bank 1, Sensor 2 - OE Replacement

2001-2003
250-24259 - Bank 1, Sensor 1 - OE Base Sensor
250-24259 - Bank 1, Sensor 2 - OE Base Sensor
250-24345 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
350-34320 - Bank 2, Sensor 1 - OE Replacement
350-34320 - Bank 2, Sensor 2 - OE Replacement
350-34598 - Bank 2, Sensor 1 - OE Replacement
350-34598 - Bank 2, Sensor 2 - OE Replacement

2004
250-24460 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
250-24253 - Bank 2, Sensor 1 - OE Base Sensor
250-24259 - Bank 2, Sensor 2 - OE Base Sensor
350-34592 - Bank 1, Sensor 1 - OE Replacement
350-34320 - Bank 1, Sensor 2 - OE Replacement
350-34039 - Bank 2, Sensor 1 - OE Replacement
350-34598 - Bank 2, Sensor 2 - OE Replacement

2005-2006
250-24460 - Bank 1, Sensor 1 - OE Base Sensor
250-24253 - Bank 1, Sensor 2 - OE Base Sensor
250-24680 - Bank 2, Sensor 1 - OE Base Sensor
250-24460 - Bank 2, Sensor 2 - OE Base Sensor
350-34592 - Bank 1, Sensor 1 - OE Replacement
350-34039 - Bank 1, Sensor 2 - OE Replacement
350-34213 - Bank 2, Sensor 1 - OE Replacement
350-34592 - Bank 2, Sensor 2 - OE Replacement


OE Base Sensor vs OE Replacement Sensor
From what little information I can find, it sounds like the "OE base sensor" is designed to be a direct replacement for OEM NTK sensors, and the "OE replacement" is a less expensive or "economy priced" version. More or less a premium vs economy thing.

It would be interesting to see which versions those who have been using Walker went with. Does the economy fall victim to the same sensor error issues that most aftermarket sensors do? Is the Base the version that line that people have been having good luck with?

These 2 videos are where I am drawing my assumption:

You have to pay very close attention the language being used. At first view I thought the videos were the same.
At 1:08 "Walker's aftermarket oxygen sensors" video titled "...OE Replacement..."


At 1:23 "With our Walker Original Equipment oxygen sensors" video titled "...OE Based..."

 
Given that NGK / NTK O2 sensors are now being discontinued, I felt that it was time to update this thread. For a long time in the TJ community it was well known that NGK / NTK O2 sensors were the only ones that didn't have issues with reoccurring OBDII error codes. Fortunately it would appear that many others in this thread have found a solution. Walker O2 sensors have been widely reported to be trouble free with our TJ PCMs.

Because of all the good feedback I've been hearing about Walker O2 sensors, I'm going to update this thread below to include all of the Walker O2 sensors (as well as links) for each year and model of TJ. Thanks to all of you who have reported on the Walker O2 sensors for making this possible.

FWIW, Walker sensors are made in Japan. This is a very good thing and a big step above any of the crap quality Chinese sensors you'll find at Autozone and the likes.


4-Cylinder Engines

1997
-2000
250-24942 - Bank 1, Sensor 1 - OE Base Sensor
250-24943 - Bank 1, Sensor 2 - OE Base Sensor
350-34511 - Bank 1, Sensor 1 - OE Replacement
350-34439 - Bank 1, Sensor 2 - OE Replacement

2001-2004
250-24345 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
350-34320 - Bank 1, Sensor 1 - OE Replacement
350-34320 - Bank 1, Sensor 2 - OE Replacement

2005-2006
250-24253 - Bank 1, Sensor 1 - OE Base Sensor
250-24253 - Bank 1, Sensor 2 - OE Base Sensor
350-34039 - Bank 1, Sensor 1 - OE Replacement
350-34039 - Bank 1, Sensor 2 - OE Replacement


6-Cylinder Engines

1997
-2000
250-24942 - Bank 1, Sensor 1 - OE Base Sensor
250-24943 - Bank 1, Sensor 2 - OE Base Sensor
350-34511 - Bank 1, Sensor 1 - OE Replacement
350-34439 - Bank 1, Sensor 2 - OE Replacement

2001-2003
250-24259 - Bank 1, Sensor 1 - OE Base Sensor
250-24259 - Bank 1, Sensor 2 - OE Base Sensor
250-24345 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
350-34320 - Bank 2, Sensor 1 - OE Replacement
350-34320 - Bank 2, Sensor 2 - OE Replacement
350-34598 - Bank 2, Sensor 1 - OE Replacement
350-34598 - Bank 2, Sensor 2 - OE Replacement

2004
250-24460 - Bank 1, Sensor 1 - OE Base Sensor
250-24345 - Bank 1, Sensor 2 - OE Base Sensor
250-24253 - Bank 2, Sensor 1 - OE Base Sensor
250-24259 - Bank 2, Sensor 2 - OE Base Sensor
350-34592 - Bank 1, Sensor 1 - OE Replacement
350-34320 - Bank 1, Sensor 2 - OE Replacement
350-34039 - Bank 2, Sensor 1 - OE Replacement
350-34598 - Bank 2, Sensor 2 - OE Replacement

2005-2006
250-24460 - Bank 1, Sensor 1 - OE Base Sensor
250-24253 - Bank 1, Sensor 2 - OE Base Sensor
250-24680 - Bank 2, Sensor 1 - OE Base Sensor
250-24460 - Bank 2, Sensor 2 - OE Base Sensor
350-34592 - Bank 1, Sensor 1 - OE Replacement
350-34039 - Bank 1, Sensor 2 - OE Replacement
350-34213 - Bank 2, Sensor 1 - OE Replacement
350-34592 - Bank 2, Sensor 2 - OE Replacement


OE Base Sensor vs OE Replacement Sensor
From what little information I can find, it sounds like the "OE base sensor" is designed to be a direct replacement for OEM NTK sensors, and the "OE replacement" is a less expensive or "economy priced" version. More or less a premium vs economy thing.

It would be interesting to see which versions those who have been using Walker went with. Does the economy fall victim to the same sensor error issues that most aftermarket sensors do? Is the Base the version that line that people have been having good luck with?

These 2 videos are where I am drawing my assumption:

You have to pay very close attention the language being used. At first view I thought the videos were the same.
At 1:08 "Walker's aftermarket oxygen sensors" video titled "...OE Replacement..."


At 1:23 "With our Walker Original Equipment oxygen sensors" video titled "...OE Based..."


Can we also add a link to this post in the OP? Because few will dig this far to find the update.
 
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Hey everyone.

I scanned my jeep for a P0155, and checked the O2 sensor voltage. Back to sensor one says low O2. Does this mean the sensor is bad, wiring or something else? Have a new Wrangler fixed ECM.
 
Hey everyone.

I scanned my jeep for a P0155, and checked the O2 sensor voltage. Back to sensor one says low O2. Does this mean the sensor is bad, wiring or something else? Have a new Wrangler fixed ECM.

If that's the only code you are getting with no engine misfire codes, and you can't find any wiring inconsistencies, I would suspect a bad O2 sensor.
 
Hi. Im all confused. I bought the 4 sensors from ntk listed in this thread for my 2004 4.0 TJ but I can only find two sensors, one right before the catalyst and one just after (down on the passenger side). The other two that should be up towards the manifold isnt there (theyre plugged)

So my question is, are there only two in my model?

I bought these four already and now wonder which two I should use?

2004
NTK #23137 - Bank 1, Sensor 1 (Upstream)
NTK #23135 - Bank 2, Sensor 1 (Upstream)
NTK #23132 - Bank 1, Sensor 2 (Downstream)
NTK #23531 - Bank 2, Sensor 2 (Downstream)


Im in sweden, european model if that makes any difference (federal then, non california)
 
Hi. Im all confused. I bought the 4 sensors from ntk listed in this thread for my 2004 4.0 TJ but I can only find two sensors, one right before the catalyst and one just after (down on the passenger side). The other two that should be up towards the manifold isnt there (theyre plugged)

So my question is, are there only two in my model?

I bought these four already and now wonder which two I should use?

2004
NTK #23137 - Bank 1, Sensor 1 (Upstream)
NTK #23135 - Bank 2, Sensor 1 (Upstream)
NTK #23132 - Bank 1, Sensor 2 (Downstream)
NTK #23531 - Bank 2, Sensor 2 (Downstream)


Im in sweden, european model if that makes any difference (federal then, non california)

European models do not adhere to the same emissions standards as US vehicles. You will have to go on the NGK/NTK website and see if they show listings for your year in an export model. If can't find one you might have to see if you can talk to one of their techs. IIRC they do show listings for export models though.
 
Hi all,

Long time reader, first time poster.

There seems to be some missing information for the year 2000 model 6 cylinder regarding Walker O2 sensors. My 2000 has 4 sensors up/down bank 1, up/down bank 2. So, I am assuming that is what I see referenced to as California emissions? I only see 2 sensors listed on the above list for the 2000 year model. Rock auto is giving me the below part #'s.

Bank 1, Sensor 1 - Walker 25024943
Bank 1, Sensor 2 - Walker25024942
Bank 2, Sensor 1 - Walker 25024942
Bank 2, Sensor 2 - Walker 25024942

It seems odd to me that 3 of the sensors are the same part number when almost all of the OE NTK sensors were different part numbers.

Can anyone verify that the info from Rock auto is correct before I order?

Thank you!
 
Hi all,

Long time reader, first time poster.

There seems to be some missing information for the year 2000 model 6 cylinder regarding Walker O2 sensors. My 2000 has 4 sensors up/down bank 1, up/down bank 2. So, I am assuming that is what I see referenced to as California emissions? I only see 2 sensors listed on the above list for the 2000 year model. Rock auto is giving me the below part #'s.

Bank 1, Sensor 1 - Walker 25024943
Bank 1, Sensor 2 - Walker25024942
Bank 2, Sensor 1 - Walker 25024942
Bank 2, Sensor 2 - Walker 25024942

It seems odd to me that 3 of the sensors are the same part number when almost all of the OE NTK sensors were different part numbers.

Can anyone verify that the info from Rock auto is correct before I order?

Thank you!

Rock auto has a pretty good track record for their listings. As for 3 of the sensors having the same number, Walker took some shortcuts when making their sensors, unlike NTK, who made the sensors to Jeep's exact specifications (including wire length), Walker just uses the longest length of wire needed to fit the application, instead of creating more part numbers for identical parameter sensors with a shorter wire.

And yes you are correct, the 4 sensor set up for the 2000 model year is the California emissions.

@Chris will have to be the one to edit the post to add the CA emissions numbers.
 
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Rock auto has a pretty good track record for their listings. As for 3 of the sensors having the same number, Walker took some shortcuts when making their sensors, unlike NTK, who made the sensors to Jeep's exact specifications (including wire length), Walker just uses the longest length of wire needed to fit the application, instead of creating more part numbers for identical parameter sensors with a shorter wire.

And yes you are correct, the 4 sensor set up for the 2000 model year is the California emissions.

@Chris will have to be the one to edit the post to add the CA emissions numbers.

You make a good point on the part numbers. Thanks for the info!
 
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Hi. Im all confused. I bought the 4 sensors from ntk listed in this thread for my 2004 4.0 TJ but I can only find two sensors, one right before the catalyst and one just after (down on the passenger side). The other two that should be up towards the manifold isnt there (theyre plugged)

So my question is, are there only two in my model?

I bought these four already and now wonder which two I should use?

2004
NTK #23137 - Bank 1, Sensor 1 (Upstream)
NTK #23135 - Bank 2, Sensor 1 (Upstream)
NTK #23132 - Bank 1, Sensor 2 (Downstream)
NTK #23531 - Bank 2, Sensor 2 (Downstream)


Im in sweden, european model if that makes any difference (federal then, non california)

Mine’s a 2004 4.0 with one cat and 2 sensors (GCC specs - Euro Stage III Emission)

NTK 23141 and NTK 23139 is what I had to go with, connectors matched and worked out for me.

Cable of 23139 is longer than needed and zip tied it to avoid any interferences.

Not sure if it’s the same scenario for euro spec but sounds like it.
 
Last edited:
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Rock auto has a pretty good track record for their listings. As for 3 of the sensors having the same number, Walker took some shortcuts when making their sensors, unlike NTK, who made the sensors to Jeep's exact specifications (including wire length), Walker just uses the longest length of wire needed to fit the application, instead of creating more part numbers for identical parameter sensors with a shorter wire.

And yes you are correct, the 4 sensor set up for the 2000 model year is the California emissions.

@Chris will have to be the one to edit the post to add the CA emissions numbers.

What's the difference with the CA Jeeps? Both of mine are listed as a CA Jeep but I've never noticed anything specifically different.
 
What's the difference with the CA Jeeps? Both of mine are listed as a CA Jeep but I've never noticed anything specifically different.

The Federal emissions versions still utilize the split style exhaust manifold but only have 2 sensors, 1 upstream, down below the y, and 1 after the cat, which is, emissions wise, more like the '99 and earlier models.
 
Hello to everyone! Long time reading , but my first post. Love this forum.
I am from Spain.
I have read all the o2 thread.

I have purchase like a Month ago the walker o2 sensors. I have been mad looking and reading what sensors to buy. Finnaly it looks that you all know again what to buy.
Till september I am not going to be able to install them. But I will also report from them when they are installed.
Thanks to everybody from Spain!
 
Last edited:
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Hi all,

Long time reader, first time poster.

There seems to be some missing information for the year 2000 model 6 cylinder regarding Walker O2 sensors. My 2000 has 4 sensors up/down bank 1, up/down bank 2. So, I am assuming that is what I see referenced to as California emissions? I only see 2 sensors listed on the above list for the 2000 year model. Rock auto is giving me the below part #'s.

Bank 1, Sensor 1 - Walker 25024943
Bank 1, Sensor 2 - Walker25024942
Bank 2, Sensor 1 - Walker 25024942
Bank 2, Sensor 2 - Walker 25024942

It seems odd to me that 3 of the sensors are the same part number when almost all of the OE NTK sensors were different part numbers.

Can anyone verify that the info from Rock auto is correct before I order?

Thank you!

I was also getting mad about this @jrob237 finnally I bought them with the repeated refs. Glad I have read now the answer of @redvltj thanks friend! Now I know for sure they are the correct ones 😅
 
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2000 4.0L, Federal Emissions. This morning I got the P0138 code on the way in to work. I had it for a little while after replacing the camshaft position sensor about a month ago, but it cleared on its own after a few days. Yesterday I pulled the battery and the PCM to replace the blower motor. Looking at Rock Auto today and I have the option of buying either a Mopar or Walker sensor. The Mopar is about $110 more than the Walker so I am wondering if I should spend the extra to be safe. I'm also worried that the sensor is functioning correctly and I've got another issue, but so far there have been no other error codes. Should I back probe the signal wire to see if it's reporting out of spec? What are the ranges I'm looking for out of that? I think that if it's been contaminated, it's going to need to be replaced either way but I want to get to the bottom of whether it's just the sensor.