O2 sensor bank 1 sensor 2

Tiny
DESIREE_2007
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 74,000 MILES
I have the vehicle listed bove l6 4.2. It is throwing code p0140 which is o2 sensor bank 1 sensor 2, but when my husband and I got the part it looks like it is sensor 1 according to location so where is the sensor 2 exactly located? I am just trying to make sure I am not confused and we are replacing the right sensor. I mean he went off the code to find the part. I guess I am just paranoid it is not the right one because I always assumed it was under the passenger side front door. First of all, bank 1 is the drivers side. And yes, it would be under the drivers door, not through the wheel well?
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Saturday, June 2nd, 2012 AT 1:35 AM

8 Replies

Tiny
ASEMASTER6371
  • EXPERT
Here is a guide to help you get the oxygen sensor changed out and the sensor locations below:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams for both engine (below). Please let us know if you need anything else to get the problem fixed.

Cheers, Roy
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Saturday, June 2nd, 2012 AT 1:40 AM
Tiny
DESIREE_2007
  • MEMBER
Thank you, it is just what I needed. I love this site.
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Saturday, June 2nd, 2012 AT 1:46 AM
Tiny
ASEMASTER6371
  • EXPERT
Good to hear. Please use 2CarPros anytime we are here to help.

Cheers, Roy
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Saturday, June 2nd, 2012 AT 1:48 AM
Tiny
ZEUS6905
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Where are they located and how do I change them?
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Wednesday, June 13th, 2018 AT 3:53 PM (Merged)
Tiny
HMAC300
  • EXPERT
There is one in front of converter and one in back depending on code that would be the one that is in need of replacement maybe. There is a tool auto parts probably rents it. Here is a link on how to do it:
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
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Wednesday, June 13th, 2018 AT 3:53 PM (Merged)
Tiny
STEVE W.
  • EXPERT
Why do you think they need to be changed? Unless they test faulty or sluggish they are likely fine. Do you have a code or codes suggesting a problem? What are they? How about driveability issues? O2 sensors get changed for a lot of reasons when they are not the actual problem.
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Wednesday, June 13th, 2018 AT 3:53 PM (Merged)
Tiny
KEN WRIGHT2
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 148,658 MILES
Where are b1 up flow and down flow sensors located?
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Wednesday, June 13th, 2018 AT 3:53 PM (Merged)
Tiny
STEVE W.
  • EXPERT
Only has two O2 sensors. One is on the exhaust manifold near the passenger side rear of the engine on the curved area. The other is in the exhaust system behind the converter.
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Wednesday, June 13th, 2018 AT 3:53 PM (Merged)

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