I am having some difficulties finding the location of post-cat O2 sensor (bank 1 sensor 2) in my car.

As far as I know the one in the picture is the upstrem (pre-cat) sensor and I am not sure where the post-cat is located.

enter image description here

Any help would be highly appreciated.

1 Answer 1


The post-cat O2 sensor is going on the on the other end of your cat.

You'll need to SAFELY get the vehicle lifted and get under it and look for the sensor on the output end of your cat.

  • So it is under the car (chassis)?
    – anon-panda
    Commented Oct 16, 2021 at 9:43
  • Yes, it will be under the car.
    – jwh20
    Commented Oct 16, 2021 at 9:52
  • something like this realoem.com/bmw/enUS/… ?
    – anon-panda
    Commented Oct 16, 2021 at 10:16
  • I believe callout #16 is your post-cat O2 sensor.
    – jwh20
    Commented Oct 16, 2021 at 10:37

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