GM 25143153 Catalytic Convertor

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Here are the steps for replacing a catalytic converter:Raise the vehicle and support it securely on jackstands.Disconnect the electrical connectors from the oxygen sensors.Remove the catalytic converter-to-exhaust pipe flange bolts and separate the exhaust pipe from the catalytic converter, supporting the exhaust pipe.Remove the bolts and detach the catalytic converter header pipe from the exhaust manifold.Remove the catalytic converter and pipe assembly.Clean the carbon deposits from the mounting flanges and install new gaskets.Installation follows the reverse of the removal procedure.

The catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream. It typically uses a three-way catalyst design with a catalytic coating containing platinum and rhodium. This design helps lower the levels of oxides of nitrogen (NOx), hydrocarbons (HC), and carbon monoxide (CO).