Mystique_TJ
New Member
I am so grateful to find this post. Pretty sure that is the only issue with my tj. I got p0151 and p0174 so hoping it’s not anything more costly ... getting a diagnostic and we will see
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The Official Jeep Wrangler TJ Oxygen (O2) Sensor Thread
- Thread starter Chris
- Start date
Hi Chris! I have a 98 tj, 4.0, 6 cylinders in line, automatic. I saw the o2 diagram and the list of o2 sensors per year. For 1997 to 1999 you list only two sensors: B1S1 and B2S2. When I read the code sensor, the code that I get is P0141 which is "O2 Sensor Heater Circuit Bank 1 Sensor 2". I'm confused on how many o2sensors my tj have and which one I need to change. I need to said that I never changed none of them. Thanks in advance!
The earlier model TJs only have two O2 sensors, whereas the later models had 4!
That code means you need to change the downstream sensor.
albert leon
New Member
Hey Guys, Thanks for putting this info on a forum... Great Idea!!!
I have a 2000 4.0 and just went on ngk.com to pick up all 4 O2 sensors. You listed that both Post Cats were 23099; they list one 23099 and one 23110. Are you suggesting both 099's because there's some benefit they don't know about, or was that just an oversight?
I have a 2000 4.0 and just went on ngk.com to pick up all 4 O2 sensors. You listed that both Post Cats were 23099; they list one 23099 and one 23110. Are you suggesting both 099's because there's some benefit they don't know about, or was that just an oversight?
You should be able to use either one, NGK lists both the 23099 and the 23110 as replacements for Bank 1, Sensor 2:
One is listed as federal emissions, while the other is listed as California emissions. But being as though TJs are 50-state vehicles, they should both work just fine.
I have a 04 TJ Unlimited is it possible that my O2 sensors may be going bad without producing any codes? Once engine is warmed up i am having a hesitation starting after I come to a complete stop and it is starting to run ruff at idle. Any suggestions would be appreciate.
Yes, that’s very, very possible. O2 sensors should be replaced ever 80k miles or so as preventative maintenance.
In you opinion should I start with the O2 sensors or the fuel system me and my husband have very different opinions on the start point
That could be a lot of things, but I'd start with the O2 sensors only because they are maintenance items that should be replaced anyways.
I'd replace the spark plugs as well (see here: What are the best spark plugs for my Jeep Wrangler TJ 4.0?) as that could have something to do with it as well. In other words, I'd give it a tune-up (especially if you don't know the last time it was done), just to get it at a baseline of good health, then diagnose from there if the issue persists.
Rod
New Member
I realize that this thread is from last year, and it was very helpful in determining sensor locations for me. But after replacing all sensors, and still throwing a O2 sensor code (heater circuit failure), I discovered the actual problem was a bad O2 sensor relay. So, for those chasing down O2 sensor codes, don't forget to check your relays.
Rod
New Member
Well, I didn't have the capability of testing it. I simply took a $20.00 gamble, bought a replacement and got lucky. "Sometimes it's better to be lucky than good!"
Just wanted to say thanks for this post. I’ve never done any repairs before today, but used this post to change my O2 sensors after my Jeep started throwing sensor error codes. So far (fingers crossed!) there haven’t been any more errors.
Stupid question time (I’m completely new to all this). I noticed my Jeep now fires right up after replacing the sensors, instead of being a little sluggish. Would the new sensors have anything to do with that?
Stupid question time (I’m completely new to all this). I noticed my Jeep now fires right up after replacing the sensors, instead of being a little sluggish. Would the new sensors have anything to do with that?
Yes! New sensors will make your Jeep run better for sure, especially if they were in need of changing.
John Wolf
TJ Enthusiast
TJ2
TJ Expert
Put a STP additive in the tank first and run it in very high idle for 1 minute at a time. That code will go away.
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