Where is the upstream O2 sensor located?

Tiny
BILL JOHNSON4
  • MEMBER
  • 2009 CHEVROLET EQUINOX
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 184,309 MILES
I need to know exactly where the upstream O2 sensor is located on my vehicle listed above and a diagram if available?
Monday, December 25th, 2023 AT 3:31 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,336 POSTS
Hi,

The upstream O2 sensor is at the rear of the engine and mounted on the exhaust manifold. I attached a pic below showing the location.

On this vehicle, there are two sensors, an upstream and a downstream. The downstream is after the catalytic converter and the upstream is before it.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pic below.
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Monday, December 25th, 2023 AT 10:03 PM

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