Where is the air filter on a 2003 Toyota Highlander?

The air filter on a 2003 Toyota Highlander is located in the engine compartment, specifically in the air filter box. To access it, open the hood and locate the rectangular air filter housing, which is typically found near the front of the engine bay, adjacent to the engine. You may need to unclip or unscrew the housing cover to remove the old filter and replace it with a new one.