O2 sensor location needed

2005 BUICK TERRAZA
45,000 MILES • 3.5L • 6 CYL • 2WD • AUTOMATIC
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GONZALO AGUDELO
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where are the O2 sensors located?
Oct 11, 2020 at 5:59 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Oct 11, 2020 at 6:28 PM
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GONZALO AGUDELO
  • MEMBER
  • 1 POST
Thanks very helpful Question did I need to change both?
Oct 14, 2020 at 2:50 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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
Oct 14, 2020 at 6:52 PM
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