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Where are the Oxygen Sensors located?

Tiny
JAMESB2019
  • MEMBER
  • 2006 PONTIAC G6
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Would you please tell me where the locations are? Please describe the exact locations not in terms of upstream or downstream but in terms of front right and left and rear right and left for each of the sensors B1S1 B2S1 B1S2 and B2S2.
Monday, August 29th, 2022 AT 4:23 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

Bank one is closest to the radiator. Bank two is closest to the firewall. As far as locations, sensor 1 will always be before the catalytic converter and sensor two will be after it.

If you look below, I attached pics of each one and its location. In the one pic, I wrote F and R, meaning front and rear of the engine.

Let me know if this helps or if you have other questions. Also, if you stand at the passenger fender and face the engine, the right side is bank one. The left side is bank two.

Take care,

Joe

See pics below.
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Monday, August 29th, 2022 AT 8:04 PM

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