Subaru Impreza Manuals 2012 Impreza Owner's Manual | Page 319

Driving tips exhaust fumes are entering the vehicle, have t he probl em checked and corrected as soon as possible. If you must drive under these conditions, drive only with all windows fully open. . Keep the trunk lid (4-door) or rear gate (5-door) closed while driving to prevent exhaust gas from entering the vehicle. Catalytic converter firing or incomplete combustion), have your vehicle checked and repaired by an authorized SUBARU dealer. . Do not apply undercoating or rust prevention treatment to the heat shield of catalytic converter and the exhaust system. . Do not drive with an extremely low fuel level. WARNING NOTE Due to the expansion and contraction of the metals used in the manufacture of the exhaust system, you may hear a crackling sound coming from the exhaust system for a short time after the engine has been shut off. This sound is normal. 8-3 The catalytic converter is installed in the exhaust system. It serves as a catalyst to reduce HC, CO and NOx in exhaust gases, thus providing cleaner exhaust. To avoid damage to the catalytic converter: . Use only unleaded fuel. Even a small amount of leaded fu [