This is a bolt-by-bolt DIY for replacing all 6 spark plugs on the V6 (2GRFE) Sienna, including the hard-to-reach rear Bank 1 spark plugs. This video also shows how to remove the intake manifold (surge tank) gasket and ignition coils. Part numbers, torque values, and helpful tools are shown.

Check the Pinned Comment for Timestamps to jump around the video as needed.

Check out this channel for a few other Sienna videos, including the starter replacement and fuel pump replacement.

I hope this video helps -- thanks for watching, and good luck with your repair!