They run down the center of the engine under the coils. You can see the coils when you remove the resonator (the thing that says Vortec 4200 on it). One bolt holds the coils in place. Remove coils and change plugs.
Actually you will need to remove the two front tire to to get to them and I would advise watching videos on the removal as two have struts blocking direct assess and you will need a flexible shaft extension or an universal joint for those two at least.
on the motor
You can find the spark plugs for your 2002 Nissan Pathfinder on each side of the engine. The spark plugs will be near the top of the engine. A six-cylinder engine will have three spark plugs on each side.
in the heads
To change spark plugs on a 5.9 2002 Dodge Ram 1500, locate the old spark plugs. These are located at the end of the 8 wires inside the vehicle's bonnet. Remove the old spark plugs and replace with new.
Screwed into the cylinder head.
You should have C.O.P. ( coil on plug ) The plugs are under the coils.
How do you change the spark plugs on a 2002 chavy trailblazer
2002 galant , can't find the spark plugs
where are the spark plugs on a vauxhall corsa 1 litre 2002
under what appears to be the valve cover on top of the engine
2002 bravada oldsmobile
they are located under the cover strip down the center of the engine. strokerace