GM 25782037 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P

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A catalytic converter is an emission control device that reduces certain pollutants in the exhaust gas stream. There are two types of converters: an oxidation catalyst that reduces hydrocarbons and carbon monoxide, and a reduction catalyst that reduces oxides of nitrogen. Vehicles are equipped with two three-way catalysts that can reduce all three pollutants. If you suspect that the converter on your vehicle is malfunctioning, take it to a dealer or authorized emission inspection facility for diagnosis and repair. Whenever you raise the vehicle to service underbody components, inspect the converter for leaks, corrosion, dents, and other damage. Although catalytic converters don't break too often, they can become plugged up. The easiest way to check for a restricted converter is to use a vacuum gauge to diagnose the effect of a blocked exhaust on the intake vacuum. To remove the converter, raise the vehicle and place it securely on jackstands, disconnect the electrical connectors for the upstream and downstream oxygen sensors, remove all four sensors, remove the nuts at each of the upper flanges that secure the front exhaust pipe assembly to the exhaust manifold flanges, remove the nuts that secure the rear flange of the front exhaust pipe assembly to the rest of the exhaust system, and remove the front exhaust pipe assembly. To install the converter, coat the threads of the nuts and bolts with anti-seize compound to facilitate future removal and tighten the nuts that secure the front exhaust pipe assembly to the exhaust manifold and to the rest of the exhaust system securely.

An oxidation catalyst reduces hydrocarbons and carbon monoxide.