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The upper "filter" is a charcoal filter meant to trap back fumes and gas vapor that may go back through the intake as part of the normal Atkinson cycle operation.

If you take close notice, the charcoal filter is not removable from the air cleaner lid. It is heat welded in place. The only way to replace the charcoal filter is to replace the entire lid of the air cleaner. Since Toyota does not specify a replacement period for this, it is pretty safe to say there is no scheduled change out period.
 
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