The Official Jeep Wrangler TJ Oxygen (O2) Sensor Thread
- Thread starter Chris
- Start date
It's my understanding that unless you have the PCM reprogrammed to fake good post cat readings not having a cat will cause your engine to run bad.
On the NTK website instead of your first one of NTK23158 they list NTK23018.
Strange because the factory parts list has the same part for two of the sensors but the NTK website lists 4 different parts.
88mharmon
New Member
88mharmon
New Member
James Brewer
Member
Are the upstream sensors interchangeable? Was is the difference between 23159 and 23160 other than cable length?
James Brewer
Member
Are the upstream sensors interchangeable? Was is the difference between 23159 and 23160 other than cable length?
What's the difference between 23159 and 23160 other than cable length?
I've got a bank 2 sensor 2 that's been throwing a code and have determined there's a short in the wiring coming off the sensor. Replaced sensor, code returned, exchanged for a new sensor, code returned, traced/ checked wiring and confirmed it's the culprit.
If I'm understanding all I've read here, this is a downstream sensor, and while it'll need to be addressed to pass emissions, it should be OK to drive as is until I can get around to fixing.
Is this correct or are are there other potential problems that could be caused if not fixed right away?
If I'm understanding all I've read here, this is a downstream sensor, and while it'll need to be addressed to pass emissions, it should be OK to drive as is until I can get around to fixing.
Is this correct or are are there other potential problems that could be caused if not fixed right away?
It's my understanding that the O2 sensors' readings effect the fuel mixture and how the engine runs. I'm not sure how bad it is for the engine in the short term though.
I know the upstream sensors help manage air/ fuel mixture. Wondering if there's no output or faulty readings from the downstream sensors if that tells the engine to change anything based on the incorrect feedback that the cats aren't functioning properly?
Bank 2 sensor 2 is only there to indicate how well the cat is doing. It does not affect fuel injector function.
The same can be said for bank 1 sensor 2
I thought a bad cat or a faulty bank 2 sensor effected the fuel settings somehow.
A bad cat can effect driveability by plugging up, too much back pressure but the #2 sensors and cats can be completely deleted and it won't change how the Jeep runs, it will just trigger the CEL and set a code.
NevadaMike
TJ Enthusiast
I replaced the upstream O2 sensor in the Jeep today. It seems to start up and run a little better than with the old one. The part of the sensor that goes into the tube looks different and smaller than the old one. I couldn’t find a manufacturers name on the old one. The new one is a NTK.
What a super helpful thread.
@Chris, could you say a little more about NTK vs NGK? I see you linked NGK, but you mention both, and NTK looks cheaper on some sites.
Edit: Oh, here it is!
https://wranglertjforum.com/threads/ngk-or-ntk-o2-sensors.37861/
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I've got a '97 2.5L. I can only find the upstream sensor that's in the engine bay (by the firewall just south of where the manifold meets the exhaust pipe). Where is my downstream sensor located?? I'm getting a P0138 code. I followed the exhaust pipe around the engine bay, but can't find this second O2 sensor. Can anyone point me in the right direction?
Ok, thanks. Could this be the remnant of the old O2 sensor? It's behind the cat up above the skidplate...but I can't see much of it. Don't even see a wire harness for it anywhere.
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Yep that looks to be the culprit.
They can be a PItA to get to unless you drop the skid.
I'm looking to do this soon on my 97 2.5L. Let me know how it goes and if you learn any lessons worth sharing before I try.