Where are spark plug on 2006 corolla?

On a 2006 Toyota Corolla, the spark plugs are located on the top of the engine, under the ignition coil assembly. To access them, you'll need to remove the ignition coils by unscrewing them, which sit directly over each spark plug. There are typically four spark plugs, corresponding to each cylinder in the engine. After removing the coils, you can use a spark plug socket to unscrew and replace the spark plugs.