OK... I will use the pic as a reference.....
This pic is oriented as if you were standing at the pass side headlight.
The right upper part is BANK 1 for cylinders 1,2,3 (front 3 cylinders of engine)..... the left upper is BANK 2, cylinders 4,5,6 (rear 3 cylinders of engine)
See those two little protrusions in the pipe just a bit below the pre-cats ( where the pipe gets smaller out from the pre-cats)? Those are the locations of (2) of your O2 sensors . The one on the left is BANK 2 SENSOR 2 ( the one you need )
and the right one is BANK 1 SENSOR 2.
The other two sensors are in the manifold where the flanges in the pic above bolt to your exhaust manifold. They are BANK 1, SENSOR 1 and BANK 2, SENSOR 1 respectively.
When you go to the auto parts store, they may ask FRONT OR REAR
or UPSTREAM OR DOWNSTREAM
You need a REAR
) O2 sensor..... BANK 2 SENSOR 2
If you crawl under your drivers side door, find the exhaust pipe and follow it up to the location of the O2 sensor... REMEMBER
... you need the REAR ONE
, closest to the driver
....use the pic above to give you an idea of what and where to look...
I hope this helps