Automotive cabin air filters are one aspect of vehicle maintenance that is often overlooked. Most cars in the U.S. that are 2001 and newer have cabin air filters. They have been around much longer in Europe. A cabin filter filters the air that circulates through your car's air duct system. A neglected filter can reduce the effectiveness of your car's climate control system, causing strain on components, and discomfort for you. Cabin air filters are easy to replace and can be relatively cheap if you shop around. Watch my video to learn how to replace a cabin air filter.