Restriction of the hybrid battery cooling fan may cause illumination of the Check Engine Light on Toyota Prius

The hybrid battery cooling fan may become restricted, resulting in illumination of the Check Engine Light and an associated fault code p0A82. Our technicians tell us that keeping the cooling fan clear of debris will help keep this fault code from setting and also may prolong the life of the hybrid battery.

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Average mileage: 134,115 (67,345–170,000)
6 model years affected: 2004, 2005, 2006, 2007, more2008, 2009
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2005 Toyota Prius 170,000 mi,
So why isn't there some kind of housing or filter to cover the fan and keep debris out?