How do you change spark plugs in a 2008 Altima?

To change the spark plugs in a 2008 Nissan Altima, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if applicable, then locate the spark plug ignition coils and disconnect the electrical connectors. Unscrew the coils to access the spark plugs, using a spark plug socket to remove them. After cleaning the threads, install the new spark plugs by hand, then tighten them to the manufacturer’s specified torque, reattach the coils, and reconnect the battery.