2009 Toyota Prius Owners Manual - Page 383

OM47614U_PRIUS_U.book Page 356 Monday, January 11, 2010 11:02 AM 4-3. Do-it-yourself maintenance NOTICE n If you remove the air cleaner filter Driving with the air cleaner filter removed may cause excessive engine wear due to dirt in the air. Also a backfire could cause a fire in the engine compartment. 356 PRIUS_U_(OM47614U)