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According to the information provided, similar to most newer vehicle models, the 2017 Ford Expedition is equipped with a cabin air filter that should be replaced approximately every 25,000 miles. These filters are effective in preventing various pollutants, dust, and pollen from circulating within the cabin. As they become clogged with dirt over time, airflow into the vehicle may be restricted. While you could opt to have a dealership handle the replacement during your next maintenance visit, it's actually a straightforward task that anyone can perform. The only tool needed is a wrench with a 7 mm socket to dismantle part of the dashboard. Acquiring a replacement filter for this specific vehicle model should be relatively inexpensive, costing around $20.
I do not have a cabin filter in my 2017 Expedition, so I need to consider installing a new one in order to improve air quality inside my vehicle.
In many cars, there is a filter that the outside air passes through before it gets into the cabin to keep out things like dirt and dust. While some cabin air filters are replaceable, others are not. For all versions of the Expedition, a replaceable cabin air filter is included as part of the standard equipment. If you notice a musty smell inside the cabin, it's a sign that the filter needs to be changed.