Rear view of engine showing the UPPER two sensors. The one boxed is
Bank 2, Sensor 1. Next to it (opposite side) on the left is
Bank 1, Sensor 1. Now, directly below and after the cat converter (but not pictured) are the 2nd set of sensors. Bank 1 & 2 number
2 sensors.
These next two pics are of the wire lead CLIPS that you have to disengage from the wiring harness. As you can see in the 2nd pic, it was easier to destroy the engagement part of the OLD sensor plug, than to try and remove it conventionally. The area is REAL tight to get to. I used a super small screw driver to break the bond. I went in from below the car to access it. On the clip pic...don't worry about those little SIDE retaining clips. They hold the end of the plug TOGETHER, but not to the mating harness plug half.
The must have tools...22mm sensor socket and flex head ratchet.
Disengaging the CLIPS was the hardest part. Hope this helps.
Max
