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Another O2 sensor question


Roadhand01

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Okay, my check engine light came on and shows Code PO133 indicating the Bank 1, Sensor 1
"Electrical circuit was responding slower than required for an undetermined amount of time".
In earlier posts it was found that two (2) of my o2 sensors were capped. Either by PO or very possibly OEM.
Anyway, I attached a couple of pictures so hopefully you can see what I have.
Is the 1st picture the Bank 1 Sensor 1? If not, where is it? If so that should be an easy fix as I just happen to have a NGK23122
In the 2nd picture you can see the caps/plugs that are located under the manifold. I wonder which these would be?
And in the last picture (I hope they are in order) is the last o2 sensor. This is located after the split and before the catalytic.

I appreciate any help with this as a warning light on is one of my pet peeves. I hate to drive with the check light on.

Bank 1 Sensor 1.jpg


Under the manifold.jpg


Maybe Bank 2 Sensor 2.jpg
 

WHBNM

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Bank 1 sensor 1 should be on the forward down pipe flange. Replaced mine not long ago.

 

L J

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Is the 1st picture the Bank 1 Sensor 1? If not, where is it? If so that should be an easy fix as I just happen to have a NGK23122

O2 sensors are located in the exhaust system. That is your intake manifold.

In the 2nd picture you can see the caps/plugs that are located under the manifold. I wonder which these would be?

The bungs for California emissions Bank 1 Sensor 1 and Bank 2 Sensor 1.

And in the last picture (I hope they are in order) is the last o2 sensor. This is located after the split and before the catalytic.

That should be your Federal emissions Bank 1 Sensor 1. Bank 1 Sensor 2 should be located after the catalytic converter.
 
OP
Roadhand01

Roadhand01

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O2 sensors are located in the exhaust system. That is your intake manifold.
Do you know what this is then?


The bungs for California emissions Bank 1 Sensor 1 and Bank 2 Sensor 1.
Well I am at a loss if one of these bongs are Bank 1 Sensor 1. How would I remove the check engine light?

That should be your Federal emissions Bank 1 Sensor 1. Bank 1 Sensor 2 should be located after the catalytic converter.
Maybe this is the one I need to change if your saying this one is also Bank 1 Sensor 1?
 

Paulstanfill85

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Aug 13, 2019
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Arlington TX
I would try cleaning the O2 sensor. They work by a differential in O2 inside and outside the exhaust system which creates an electrical current. If there is no short which the P code would indicate, then clean the sensor first and reinstall it after clearing your codes and see what happens. This type of problem occurs frequently when leaded fuel is used in motorcycle engines equipped with O2 sensors. Then again, if the sensor is cheap enough you may not want to waste your time fooling around with it.
 

L J

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Do you know what this is then?

it looks like an intake air temperature sender

Well I am at a loss if one of these bongs are Bank 1 Sensor 1.

Only for a California emissions TJ. You should have a Federal emissions TJ which doesn't use those bungs.

How would I remove the check engine light?

You can clear the fault code causing the light to come on by using a cheap code reader from Amazon or disconnecting the battery for several minutes but if the fault is still present the light will come back on.

Maybe this is the one I need to change if your saying this one is also Bank 1 Sensor 1?

It should be. I'm usually not an advocate of firing the parts cannon but in this case NTK O2 sensors are inexpensive and the part looks to be an easy R&R.
 
Last edited:
OP
Roadhand01

Roadhand01

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it looks like an intake air temperature sender



Only for a California emissions TJ. You should have a Federal emissions TJ which doesn't use those bungs.
But I do have the bongs so, I guess it could be OEM or the PO capped them.

You can clear the fault code causing the light to come on by using a cheap code reader from Amazon or disconnecting the battery for several minutes but if the fault is still present the light will come back on.
Well what started this all has stopped. I started it this morning, drove about 20 miles. Since it was chilly, I left it running to keep the only girl who really loves me warm. It idled about 30 mins and when I got in to go home, it was off. SO no check light on but I need to fix whatever it was if possible.
Now if I were to replace it (The Federal Bank 1 Sensor 1 you spoke of) would I use the NGK 23122??

It should be. I'm usually not an advocate of firing the parts cannon but in this case NTK O2 sensors are inexpensive and the part looks to be an easy R&R. I have the NEK
 

L J

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But I do have the bongs so, I guess it could be OEM or the PO capped them.

It is possible that the factory only made one manifold to use on both Federal and California TJs.

Now if I were to replace it (The Federal Bank 1 Sensor 1 you spoke of) would I use the NGK 23122??

Yes. You might as well install it since you already have it.