owners manual Porsche Panamera

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How Emission Control WorksOxygen sensor The catalytic converters will be damaged by: When an automobile engine is running, it uses The oxygen sensor, installed in the exhaust pipe – push or tow starting the vehicle energy generated through the combustion of a continuously senses the oxygen content of the – misfiring of the engine mixture of air and fuel. Depending on whether a exhaust and signals the information to an – turning off the ignition while the vehicle is car is driven fast or slowly or whether the engine electronic control unit. The control unit corrects moving or is cold or hot, some of the fuel (hydrocarbons) the air/fuel ratio, so the engine always receives an may not be burned completely, but may be accurately metered air/fuel mixture.– driving until the fuel tank is completely empty discharged into the engine crankcase or exhaust – by other unusual operating conditions. system. Additonal hydrocarbons may enter the Crankcase ventilationf Do not continue to operate your vehicle under atmosphere through evaporation of fuel from the fuel tank. These hydrocarbons (HC), when Through crankcase ventilation, undesirable these conditions, since raw fuel might reach released into the air, contribute to undesirable emissions from the engine crankcase are not the catalytic converters. This could result in pollution. permitted to reach the outside atmosphere. These overheating of the converters. Federal law In addition, carbon monoxide (CO) and oxides of emissions are recirculated from the crankcase to prohibits use of leaded fuel in this car. nitrogen (NOx) contribute to engine emissions. the air intake system. From here the emissions They, too, are formed during the combustion mix with the intake air and are later burned in the process and discharged into the exhaust system.engine. To reduce these pollutants, your Porsche is Catalytic converters equipped with a precisely calibrated fuel injection system to assure a finely balanced air/fuel mixture The catalytic converters are efficient “clean-up” under all operating conditions.devices built into the exhaust system of the vehicle. The catalytic converters burn the undesirable pollutants in the exhaust gas before it is released into the atmosphere. The exclusive use of unleaded fuel is critically important for the life of the catalytic converters. Therefore, only unleaded fuel must be used. Maintenance and Car Care 263

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