A 2015 Toyota Sienna cabin air filter is responsible for removing contaminants from the air that is used by the climate control system to provide clean air to the passengers. If you follow the service intervals in the owner's manual, you'll likely never have a problem. If the filter stays in the car for too long, it'll lead to less air flow and potentially louder operation of, and strange smells from, the climate control system. Find the right part for the right price when you shop for 2015 Sienna cabin air filters at AutoZone.