How do you replace spark plug seals on a 1999 Lexus ES300?

To replace the spark plug seals on a 1999 Lexus ES300, first, remove the engine cover and disconnect the ignition coils by unscrewing them. Carefully pull the coils out and then remove the spark plugs using a spark plug socket. Replace the old rubber seals on the spark plug tubes, ensuring they fit snugly, and reassemble by reinstalling the spark plugs and coils before securing the engine cover back in place. Always check for any oil leaks after reinstallation.