Where are the spark plugs located on 2000 maxima?
There is a cover to remove with 5 Allen screws on the top front of the motor, after you take off the plate you will see 3 black boxes with a 10mm bolt in them, remove the bolt and pull up the black box. Down that hole is the plug. You will need an extension on your socket to get them out. Be extremely careful when you replace the plug. They are easy to cross thread as you can not install with your fingers. A rubber hose over the end of the plug and drop it down to get it started is best.
There are no plug wires from a distributor like the old cars used to have. As for the rear ones....Good luck with that. No cover to remove but they are hard to find, see and access for replacement. They were not thinking about us when they built this car!