How do you locate and change a spark plug on a 2003 ES 300 Lexus?

To locate and change a spark plug on a 2003 Lexus ES 300, first, ensure the engine is cool and disconnect the negative battery cable. Remove the engine cover by unscrewing any bolts, then locate the spark plug wires or ignition coils on top of the engine. Carefully detach the wires or coils, then use a spark plug socket and ratchet to unscrew the old spark plug. Replace it with a new one, reattach the wires or coils, and reassemble the engine cover before reconnecting the battery.