<scratching head> I've only seen two air filters mentioned for regular maintenance in the Prius Passport to Performance (scheduled maintenance guide). One is the engine air filter, and the other is the passenger cabin AC filter.Tony Liscio said::?: Where in the manual can I find the mileage the upper air filter is to be changed? I am at 10,k miles and changed the lower one 2 times.
Yes! dirty air in the area I live.