How do you change the spark plugs on a 2003 Mitsubishi outlander?

To change the spark plugs on a 2003 Mitsubishi Outlander, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil or spark plug wires to access the spark plugs, then use a spark plug socket and ratchet to unscrew and remove the old plugs. Before installing new plugs, check the gap with a gauge and adjust if necessary; then, install and hand-tighten the new plugs, followed by reattaching the ignition coils or wires. Finally, reconnect the battery and start the engine to ensure proper operation.