Rattle sound never experienced prior to maintenance check at Toyota

[WeeYari]

Originally Posted by Dodge Aries K

Probably an exhaust heat shield

Agreed.

Reach in behind the engine and see if you can wiggle the exhaust manifold heat shield. Mine rattled horribly with foot on brake at stop lights when its mounts had finally deteriorated. If it is still firm, crawl under the car and see if any of the other shields placed along the exhaust route are loose.