the Sentra has oil packs that are on each cylinder which means that there are no plug wires. It also looks as though the plugs are hidden because there are 4 black squares that are screwed to the top of the engine (under the plastic engine cover) when you unscrew the 4 plastic blocks and pull them up they will be solid plastic tubes down to the plugs and once removed you can change out the plugs as on a "Normal" engine.
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
where is PVC valve located on 2002 Nissan sentra
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
they are located under the cover strip down the center of the engine. strokerace