2004 Hyundai Elantra Owner's Manual - Page 108

FEATURES OF YOUR HYUNDAI 1 97 ! CAUTION: o Replace the filter every 12,000 miles (20,000 km) or once a year. If the car is being driven in severe conditions such as dusty, rough roads, more frequent air filter inspections and changes are required. o When the air flow rate is decreased, it must be checked at an authorized dealer. o If your vehicle is not equipped with this filter, it can be installed by your dealer. Check with your dealer for details.