Kia Optima Hybrid 2017 Owner's Manual page 586

AIR CLEANER
Filter replacement
It must be replaced when necessary,
and should not be washed.
You can clean the filter when inspecting
the air cleaner element.
Clean the filter by using compressed
air.
1. Pull out the air cleaner cover.
2. Unlock by turning the locking lever
downward.
3. Pull the air cleaner filter to replace.
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