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O2 sensor location needed

Tiny
GONZALO AGUDELO
  • MEMBER
  • 2005 BUICK TERRAZA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 45,000 MILES
Where are the O2 sensors located?
Sunday, October 11th, 2020 AT 5:59 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

I attached a pic below. See if it helps and let me know if you have questions.

This guide can help you step by step to change out the sensors:

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

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

Take care,
Joe
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Sunday, October 11th, 2020 AT 6:28 PM
Tiny
GONZALO AGUDELO
  • MEMBER
  • 1 POST
Thanks very helpful Question did I need to change both?
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Wednesday, October 14th, 2020 AT 2:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Hi,

First, you are very welcome. As far as replacement, the diagnostic trouble code that was retrieved should indicate which one is the issue. By any chance, do you remember what the code was that was found? In most cases, both do not need replaced at the same time.

Let me know.

Joe
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Wednesday, October 14th, 2020 AT 6:52 PM

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