Review on Set of 2 Camshaft Position Sensors - Engine Phase Compatible with Nissan and Infiniti 3.5L, 4.0L V6 Altima, Maxima, 350Z, Pathfinder, FX35, G35, QX45 - Replaces 23731-AL61A, 917-704, 237316J90B, 907-716 by David Caldwell

They could just be installed, but let Nissan's engineers or designers say no, they have them on the back of the block. Personally I think we need to gather all the engineers and designers together and get them in front of the barn and give them a good ol' smack in the office, you got the old ones out, the messages came through with no problem, and the price don't know, buy this most expensive or the cheapest. It was close to the cheapest, they are OEM parts and that's not all, they come with a lifetime warranty. I hope I ever have to use it, but it's nice to know you have it