1. Remove the air cleaner element. (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
2. Inspect the following items:
Has the replacement interval past?
Is the air cleaner element soiled, damaged, or bent?
Are the air cleaner case and the air cleaner element correctly sealed?
Is the correct air cleaner element installed?
If there is any abnormality, clean or replace the air cleaner element. (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)