How many o2 sensors are on this vehicle?

2007 GMC ENVOY
110,469 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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STEVE620
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Tried looking for the one downstream and i couldn't find it unless it was hidden.
Thanks.
Dec 27, 2021 at 7:44 AM
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AL514
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Hello, this vehicle has two oxygen sensors, the rear one is behind the Catalytic Converter. Below is a picture of its location to the right side of the transmission.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
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Dec 27, 2021 at 9:05 AM