Most late model Toyota automobiles are now equipped with cabin air filters. Many people neglect these filters, as they are easily forgotten. Regular replacement of cabin air filters can help prevent annoying odors from developing in your car, as well as keep the air that you are breathing inside your car clean. Most dealerships recommend cabin air filter replacement every 30,000 miles, or more often if you are operating your car in a very dusty environment.
This post is an example of cabin air filter replacement on a 2006 Toyota Avalon. The procedure for cabin air filter replacement is similar on the entire Toyota lineup. All you must do to gain access to the cabin air filter is to remove the glovebox. Once you remove the glovebox, you'll something that looks like this below. (minus the yellow arrows)
You'll need to press the cabin air filter cover retainer tabs inward towards each other. (Where the yellow arrows are pointing.) This will release the cover from the cabin filter housing, and you'll be able to pull it straight out. Once the cabin filter is covered, go ahead and pull the cabin air filter out too. Here's what you'll be looking at once the cabin air filter is removed.
As you can see below, the air filter in this car was quite dirty. (The replacement filter is on the right.) It is not uncommon to see filters even more dirty than this. Once the cabin air filter was replaced in the car, the interior air quality of recirculated air improved significantly.