O2 sensor bank 1 sensor 2

Tiny
DESIREE_2007
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 74,000 MILES
I have a 2005 chevy trailblazer 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?
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Saturday, June 2nd, 2012 AT 1:35 AM

10 Replies

Tiny
ASEMASTER6371
  • EXPERT
Behind the cat converter.

Roy
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Saturday, June 2nd, 2012 AT 1:40 AM
Tiny
DESIREE_2007
  • MEMBER
Ok so the person at the auto parts store gave us a sensor and the sensor that we have is located under the hood. We go through the wheel well to find it
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Saturday, June 2nd, 2012 AT 1:46 AM
Tiny
ASEMASTER6371
  • EXPERT
No, sensor 2 is under the truck behind or downstream of the cat converter

Roy
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Saturday, June 2nd, 2012 AT 1:48 AM
Tiny
DESIREE_2007
  • MEMBER
Im just trying to make sure im 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 isnt the right one cause I always assumed it was under the passenger side front door
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Saturday, June 2nd, 2012 AT 1:48 AM
Tiny
DESIREE_2007
  • MEMBER
Ok I understand now I am pretty sure he gave us sensor 1 instead
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Saturday, June 2nd, 2012 AT 1:49 AM
Tiny
ASEMASTER6371
  • EXPERT
First of all, bank 1 is the drivers side. And yes, it would be under the drivers door, not through the wheel well

dont be surprised if the sensor does not repair the truck. A code never identifies a bad part, just a failed system.

You got the opinion of a parts salesman, not a technician.

Roy
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Saturday, June 2nd, 2012 AT 1:51 AM
Tiny
DESIREE_2007
  • MEMBER
I have an inline 6 not v6
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Saturday, June 2nd, 2012 AT 1:55 AM
Tiny
ASEMASTER6371
  • EXPERT
Ok, bank 1 is the front group of 3 cylinders.

Roy
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Saturday, June 2nd, 2012 AT 1:57 AM
Tiny
DESIREE_2007
  • MEMBER
Ok so the sensor 2 for that one would be under the door or by the wheel well? Sorry im just really confused and cant find anything online except you and it is much appreciated
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Saturday, June 2nd, 2012 AT 2:05 AM
Tiny
ASEMASTER6371
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Yes, that would be correct and your welcome.

Roy
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Saturday, June 2nd, 2012 AT 2:06 AM

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