It's located deep in the valley! Under the "LOWER intake manifold". copy and paste this link in your browser, or try clicking on it. It may be helpful to you.
http://x.nissanhelp.com/forums/pathfinder/7890-3-3l-knock-sensor-relocation.html
I didn't find this link until after I had already disassembled my truck. This is the hardest job that I've taken on thus far, hope I can put it all back together properly. I changed the gaskets on the valve covers since I had everything off.
To answer your question: It's under your lower intake manifold, so it's a hard job!
The best thing to do is relocate it I'm pretty sure they come with the stuff to do it
SOURCE: how to replace
get a swivle and i think its a 10 mill. then its under the intake manifold unplug it then take it out its black with a gold screw may need a flash light
SOURCE: nissan
OK the sensor may not be bad, you might have a broken wire to the sensor. Or a bad plug, I would by pass the sensor plug - cut it out. Cut one wire at the time and reconect using a crimp on union (bu**) conector. You may also have a timing issue, that a tune up might fix..
Testimonial: "the code is when in star the car. made up tun. give me your email please"
SOURCE: How to replace knock sensor in 1995 NISSAN ALTIMA?
Remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housing once you have remove all the above, your engine will look naked, you can see the location of the knock sensor is locate in the engine valle.
SOURCE: 1998 Nissan Pathfinder - Code P1444
Clean your mass air flow sensor with electrical contact cleaner. It's located between your air box and intake when it gets dirty it tricks your car into thinking it's getting less air than it is
SOURCE: knock sensor 1996 v6 3.3 nissan pathfinder
the knock sensor is located under the intake PLENUM the crank sensor is located at the crank gear under the timing belt cover neither one is very much fun to do!
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