Subaru Impreza Manuals 2015 Impreza Owner's Manual | Page 457

Driving tips/Catalytic converter exhaust fumes are entering the vehicle, have the problem 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 p &