
The engine air filter protects the intake tract and mass airflow sensor from dust and debris. The cabin air filter protects occupants from dust, pollen, and odors. Both are easy to forget and both directly affect drivability or comfort when neglected.

AT4X trims kick up far more dust than a Denali doing highway towing — check more often if you wheel regularly.

A clogged cabin filter reduces HVAC airflow and can produce musty smells. It's a simple, usually tool-free swap accessible behind the glovebox on most Yukon and Sierra model years.
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