If your Nissan starts to show signs of performance problems, such as lower fuel efficiency, or if you see the "Check Engine" light come on, it's time to take a closer look. The problem may lie with the engine air filter, which is a small part that plays a significant role in your vehicle's overall health. The engine air filter ensures that sufficient amounts of purified air circulates in the fuel lines. A clean air filter keeps the engine running smoothly, enables seamless gear shifting, and prevents potentially hazardous contaminants from entering the engine and causing irreparable damage. By preventing engine damage, the air filter can ultimately save money on car repairs. If your car has a healthy engine, it will also last longer and require fewer trips to the dealership for service.