2018 Toyo Sequoia. Loud rattle from front end upon shutdown.

Definitely have the dealer take a look but if I had to guess I'd say its the engine fan or if you have air suspension it could be a pressure release. Its going to be hard to tell for sure without taking a listen. Alex

Well IF your curiosity is getting the best of you - raise hood and listen while an assistant goes through the necessary motions .. It's likely you'll find the noise - however it would be wise to have the dealer check it out since it's under factory warranty.