2009 Dodge Journey Owner's Manual - Page 431

MAINTAINING YOUR VEHICLE 429 Spark Plugs Spark plugs must fire properly to assure engine performance and emissions control. New plugs should be installed at the specified mileage. The entire set should be replaced if there is any malfunction due to a faulty spark plug. Refer to "Fluids, Lubricants, and Genuine Parts" in this section for the proper type of spark plug for use in your vehicle. Engine Air Cleaner Filter Refer to the Maintenance Schedule in Section 8 for engine air cleaner filter service intervals. NOTE: Be sure to follow the "dusty or off-road conditions" maintenance interval if applicable. WARNING! The air induction system (air cleaner, hoses, etc.,) can provide a measure of protection in the case of engine backfire. Do not remove the air induction system (air cleaner, hoses, etc.,) unless such removal is necessary for repair or maintenance. Make sure that no one is near the engine compartment before starting the vehicle with the air induction system (air cleaner, hoses, etc.,) removed. Failure to do so can result in serious personal injury. Catalytic Converter The catalytic converter requires the use of unleaded fuel only. Leaded gasoline will destroy the effectiveness of the catalyst as an emissions control device. 7