2003 Toyota Prius Owners Manual - Page 225

4. Install the filter and filter case in the reverse order of removal. Set the filter in the filter case correctly. INFORMATION 82p008a 82p009a The air filter should be installed properly in position. The use of air conditioning with the air filter removed may cause deteriorated dustproof performance and then affect air conditioning performance. 2. Pull the filter case toward you to take it out. 3. Remove the filter from the filter case and replace it with a new one. 218