Whether you're driving a Toyota or Scion, it comes off the factory line with original air filters. Their job: to keep contaminants from accumulating on and in engine parts and clogging your HVAC system. However, even high-quality factory air filters like Toyota & Scion make eventually degrade. This causes several problems. An engine air filter full of gunk, for example, raises your air-to-fuel ratio, leading to inefficient engine operation, misfires, reduced fuel economy, and higher emissions. A dusty, pollen-filled cabin air filter can cut airflow through ducts and vents, making your heating and air conditioning systems malfunction. This can mean interior temperature abnormalities, poor cabin air, and undue stress on your motor. If you see brittle filter fibers, your filter surfaces are badly discolored, or there's a lot of build-up, it's a good time to change air filters. Signs of engine filter problems also include unusual engine noise or the production of too much exhaust. Symptoms of cabin air filter problems include bad smells and worse airflow. Genuine Toyota or Scion air filters are your best bet for replacement, as an OEM filter always comes compatible with your model. Our auto parts counter has plenty in stock at low cost and ordering online is as easy as a few clicks. Buy now, save time, and save money!