If I can jump in and add a little more. These diagrams appear to be backwards. From my experience it is in the front of the engine by the alternator on most 4 cylinder Nissans. Last picture is from a different angle but shows the sensor and connector. Just make sure you drain the coolant down because it will come out when you remove the sensor.
Hopefully this helps. Thanks
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Friday, February 7th, 2020 AT 6:20 PM