The check engine light is designed to alert you that your vehicle is experiencing trouble with the emissions system. Two possible scenarios can happen: if the check engine light is on and not blinking, you need to bring your vehicle to Fuji's Service Center as soon as possible, to have the vehicle checked over by one of our Subaru Certified factory-trained technicians. If the check engine light is blinking, you need to pull your vehicle over immediately and have your vehicle towed to our center. A loose gas cap is a common cause of check engine lights. Be sure to check your gas cap every time you fill your vehicle to ensure that it is properly tightened.