DIY: 2011 Sienna Engine & Cabin Filter Replacement
This video shows how to replace the engine and cabin air filters on a 2011 Sienna. I think this method works for model years 2011-2016 but you'll need to check to make sure.
Here's the link to the engine air filter: http://amzn.to/2y3ro5w
Here's the link to the cabin air filter: http://amzn.to/2ybJpj0