Bank 1 cam sensor is located on the back of the right bank (or passenger side in North America) cylinder head. It's a bit of a pain to get to it. It'll be have a single, 10MM head bolt holding it in. I recommend sticking with genuine Nissan parts as aftermarkets have been problematic. Of the parts shown where you are shopping, I would go with the Hitachi if you insist on going the aftermarket route. Hitachi is the OE supplier of the sensor to Nissan, so it should be of the same quality.
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