GM 25314447 Catalytic Converter

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The catalytic converter is an emission control device added to the exhaust system to reduce pollutants from the exhaust gas stream. These systems are equipped with a single bed monolith catalytic converter. This monolithic converter contains a honeycomb mesh which is also coated with two types of catalysts. One type is the oxidation catalyst while the other type is a three-way catalyst that contains platinum and palladium. The three-way catalyst lowers the levels of oxides of nitrogen (NOx) as well as hydrocarbons (HG) and carbon monoxide (CO) emissions. The oxidation catalyst lowers the levels of hydrocarbons and carbon monoxide. If the PCM detects a reduction in the efficiency of the catalytic converter a code P0420 or P0430 will set. The test equipment for a catalytic converter is expensive and highly sophisticated. If you suspect the converter is malfunctioning, take it to a dealer service department or authorized emissions inspection facility for diagnosis and repair. Whenever the vehicle is raised for service of underbody components, check the converter for leaks, corrosion and other damage. If damage is discovered, the converter should be replaced. Because the converter is welded to the exhaust system, converter replacement requires removal of the exhaust pipe assembly. Take the vehicle, or the exhaust system, to a dealer service department or a muffler shop.

When the vehicle is raised for service of underbody components, the converter should be checked for leaks, corrosion, and other damage.