How do you change the spark plugs on a 2006 scion xb?

To change the spark plugs on a 2006 Scion xB, first ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if necessary, then locate the spark plugs and disconnect the ignition coil connectors. Use a spark plug socket and ratchet to remove the old spark plugs and install the new ones, ensuring they are properly gapped. Finally, reconnect the ignition coils and battery terminal, and start the engine to ensure everything is functioning correctly.