Is there a cabin air filter in 2003 Toyota Sienna?

Yes, the 2003 Toyota Sienna has a cabin air filter. It is located behind the glove compartment. To access it, open the glove compartment and remove the two Phillips head screws that hold the filter cover in place. Once the cover is removed, you can slide the filter out and replace it with a new one. Here are the steps on how to replace the cabin air filter in a 2003 Toyota Sienna:

1. Open the glove compartment
2. Remove the two Phillips head screws that hold the filter cover in place
3. Remove the filter cover
4. Slide out the old filter
5. Place a new filter in the filter housing, making sure the arrow on the filter is pointing in the same direction as the airflow into the housing (arrow should be pointing towards passenger compartment)
6. Replace the filter cover
7. Replace the two screws that hold the filter cover in place
8. Close the glove compartment