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Unread 09-11-2009, 08:02 AM   #1
rvsmith88
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Bank 1 vs. Bank 2 o2 sensor location

What is the location of #1 Cylinder on a 2004 4.0l. Is it the drivers side or the passenger side of the engine. I have a o2 sensor code Bank 1 sensor #2.

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Unread 09-11-2009, 08:45 AM   #2
Alexia
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Originally Posted by rvsmith88 View Post
What is the location of #1 Cylinder on a 2004 4.0l. Is it the drivers side or the passenger side of the engine. I have a o2 sensor code Bank 1 sensor #2.
Experimental Insanity! - Oxygen Sensor Resource
Downstream, Front Manifold - Bank One, Sensor Two
ODBII Codes: P0136, P0137, P0138, P0139, P0140, P0141, P0143, P0144, P0145, P0146, P0147
Physically located towards the front of the vehicle after the mini-catalytic converter.
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Unread 09-11-2009, 09:04 AM   #3
rvsmith88
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Bank 1

Which side of the engine/exhaust is bank 1. Driver's side or passenger's side. The code is P0 138.
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Unread 09-11-2009, 09:33 AM   #4
Alexia
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Originally Posted by rvsmith88 View Post
Which side of the engine/exhaust is bank 1. Driver's side or passenger's side. The code is P0 138.
Both banks are located on the driver's side. Bank one is towards the front of the engine.
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Unread 10-30-2010, 07:55 AM   #5
armartel
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does anyone have any pictures of the o2 sensors? I searched through the forum, but couldn't find anything.
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Unread 12-01-2010, 11:12 AM   #6
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Originally Posted by armartel View Post
does anyone have any pictures of the o2 sensors? I searched through the forum, but couldn't find anything.
That would be helpful. I have a 2006 Rubicon with code P0137 indicating Downstream, Front Manifold - Bank One, Sensor Two; Physically located towards the front of the vehicle after the mini-catalytic converter.

Pictures would be helpful as I am unsure where to look. TY.
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Unread 12-01-2010, 12:31 PM   #7
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Unread 12-01-2010, 12:35 PM   #8
NotURMailman
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Originally Posted by jakesteel1 View Post
That would be helpful. I have a 2006 Rubicon with code P0137 indicating Downstream, Front Manifold - Bank One, Sensor Two; Physically located towards the front of the vehicle after the mini-catalytic converter.

Pictures would be helpful as I am unsure where to look. TY.
Follow the exhaust down from the #1 cylinder at the cylinder head. #1,2,and 3 will come together into one pipe. Follow that pipe down through the "mini" catalytic converter. The first sensor that you come to after that converter is the one you're looking for.
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Unread 12-01-2010, 12:38 PM   #9
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Originally Posted by NotURMailman View Post
Follow the exhaust down from the #1 cylinder at the cylinder head. #1,2,and 3 will come together into one pipe. Follow that pipe down through the "mini" catalytic converter. The first sensor that you come to after that converter is the one you're looking for.
Just open the hood and take a look. Pretty hard to miss. Picture is not going to show you anymore than what you will see when you take a look. Not real confusing.
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Unread 12-01-2010, 01:12 PM   #10
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Originally Posted by rvsmith88 View Post
Which side of the engine/exhaust is bank 1. Driver's side or passenger's side. The code is P0 138.
You better open your hood and look. You don't have a V6 you have an inline 6. The cyls are numbered 123456 from front to rear.

Bank 1 is fed by cyls 1,2and 3 and sensor 2 is after the cat in #1 bank.
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Unread 12-01-2010, 02:58 PM   #11
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Originally Posted by NotURMailman View Post
Follow the exhaust down from the #1 cylinder at the cylinder head. #1,2,and 3 will come together into one pipe. Follow that pipe down through the "mini" catalytic converter. The first sensor that you come to after that converter is the one you're looking for.
While this explanation helps to clarify, I took some pics.

I am looking for: P0137 indicating Downstream, Front Manifold - Bank One, Sensor Two; Physically located towards the front of the vehicle after the mini-catalytic converter.

These two were the furthest away, the one on the left being towards the front.



Then there were these 2 closer to the bottom of the Jeep. This one being closer to the front:



This one being closer to the rear:

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Unread 12-01-2010, 08:37 PM   #12
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Originally Posted by jakesteel1 View Post
While this explanation helps to clarify, I took some pics.

I am looking for: P0137 indicating Downstream, Front Manifold - Bank One, Sensor Two; Physically located towards the front of the vehicle after the mini-catalytic converter.

These two were the furthest away, the one on the left being towards the front.

The one on the left is bank 1, on the right is bank 2. Both upstream.


Quote:
Then there were these 2 closer to the bottom of the Jeep. This one being closer to the front:

Bank 1 downstream

Quote:
This one being closer to the rear:

Bank 2 downstream. Hope that helps.

PS. I'm so glad I don't live in a salt infested area. Wow.
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Unread 12-01-2010, 10:45 PM   #13
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Originally Posted by jakesteel1 View Post
While this explanation helps to clarify, I took some pics.

I am looking for: P0137 indicating Downstream, Front Manifold - Bank One, Sensor Two; Physically located towards the front of the vehicle after the mini-catalytic converter.



Then there were these 2 closer to the bottom of the Jeep. This one being closer to the front:


This is the one you want to remove that is causing your problems.
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Unread 05-04-2012, 01:34 PM   #14
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ok so...i realize the factory manual uses the designations 1/1, 2/1,1/2,2/2 for the O2 sensors, however, the parts store only labels the sensors as front upstream, rear upstream, front downstream, rear downstream. am i correct in assuming that 1/1 is F/U, 2/1 R/U, 1/2 R/U, 2/2 R/D?
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Unread 05-04-2012, 01:36 PM   #15
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Originally Posted by 04ollllloguy View Post
ok so...i realize the factory manual uses the designations 1/1, 2/1,1/2,2/2 for the O2 sensors, however, the parts store only labels the sensors as front upstream, rear upstream, front downstream, rear downstream. am i correct in assuming that 1/1 is F/U, 2/1 R/U, 1/2 F/D, 2/2 R/D?
Fixed it for you.
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