How do I change the sparks plug for my 2000 Pathfinder?

Could be crank sensor. Or could be the immobiliser you will need to get it pluged in to see for sure.

check for l.oose /damaged wires to cam/ crank position sensors

What do you mean "the battery still no fire"?

Do you mean that there is no spark at the spark plug?
Have you pulled out a plug, grounded it and cranked the engine to check to see what colour (if any) the spark is?
If there is no spark at the plug, then either change the plugs if they look to be in very poor condition, or change the coil.

have you tryed changeing out plug wires and spark plugs

fuel filter?

you need to get a diaghram on the firing order of your spark plug

wires, almost any autoparts store will give you the firing order for

your vehicle. if the firing order is incorrect the engine can sound

like its falling apart. the spark plugs also need to be gapped

correctly, they are not always pre-gapped or check the gap of

one of your old spark plugs and match the gap with the new ones.

good luck!

is the engine light on? if so what is the code? ensure could fuel (no water)? check for a strong blue spark at spark plug wire? a number of things could cause this problem. more information is a must

It could be a defective ignition switch.

you might check the cranshaft sensor, it controls the spark to the plugs and coil

replace coil pack, or check fuel pump is working,worst case peplace ecu(engine management computor unit)check spark leads,and fit new spark plugs,discard all the ones in the engine ,thats in there,with new ones,,,,,,,