1996-2001 Nissan Altima Spark Plugs Replacement Procedure
1. Disconnect car battery.
2.Pull out the spark plugs wires.
3. You will need a 5/8 socket, extension and ratchet to remove the spark plugs.
4. Remove #1 spark plugs.
5.Repeat the above steps for spark plugs #2, #3 and #4.
6.Reinstall new spark plugs wires.
7. Reinstall the car battery.