I work at a dealership. Non toyota, but I do know for a fact that CERTAIN emissions parts are covered by a federally madated 8 year 80,000 mile warranty. In case you are curious I work at a Jaguar dealership. We warranty all parts for the(minus the obvious wear items)remainder af the factory warranty, which in our case is 4 year 50,000 miles. But all manufacturers are different. I don't think that the PCV in covered under the federal mandate. That is mostly for item like cats.
Hope this helps.
Hope this helps.