Unplug the electrical plug/connector from the base of sensor. You will have to take out bolt from the head of the sensor that threads into the cylinder head. Thats really it. Unplug - Unscrew - replace!
Ok I just did this on 02 xterra 3.3 L v6. Knock sensor is located under your lower intake manifold on the engine block. You have to remove all the wiring out of way, remove upper and lower intake manifold. Sensor is in center of engine block. I would advise replacing all your hoses and valve cover gaskets and intake gaskets while you have all this off. BE sure not to screw knock sensor too tight when replacing. If you crack the plastic sensor it will throw code still. This is a job, takes time but not too hard
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SOURCE: Diagram available for 01 Nissan Xterra Knock Sensor location?
V6 3.3L The sensor is located underneath the air intake manifold on top
of the engine block. This should take an experienced mechanic about 3-4
hours to replace.
Fig. Engine compartment component locations
Hope this help (remember rated this free help) Good luck.
SOURCE: nissan xterra knock sensor
I have a 2000 Nissan Xterra my check engine light came on the scanner read knock sensor came up how to replace it and location
SOURCE: where is the knock sensor for the 04 nissan xterra
Your knock sensor is located undernesth the air intake manifold on top of the engine block. This goes for 2000-2004 xterra V6 3.3L models.
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.
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