[Replacing Sensor on 1999 Pathfinder 4X4]

I have found a video that shows me how to relocate the knock sensor that needs replacing but I can't find anything on the bank 1 sensor 2 and the bank 2 sensor 2 that also need replacing. Any thoughts?

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Just bought a 1999 Pathfinder with over 253,000 miles on it. It runs great but I'm sure I'll need plenty of help starting with replacing several sensors that need replacing.