How do you change spark plugs on a 2004 Hyundai XG350L?

To change the spark plugs on a 2004 Hyundai XG350L, first, ensure the engine is cool and disconnect the negative battery cable. Remove the ignition coil assemblies by unscrewing them and gently pulling them out, then use a spark plug socket to carefully unscrew the old spark plugs. Install the new spark plugs with the correct torque specification and reassemble the ignition coils. Finally, reconnect the battery and start the engine to check for proper operation.