Because of a Federally mandated extended warranty which covers emissions-related components such as the catalytic converter, check with a dealer service department before replacing the converter at your own expense. The catalytic converter is an emission control device added to the exhaust system to reduce pollutants from the exhaust gas stream. Early models are equipped with two catalytic converters; one at the exhaust manifold and one under the vehicle. Later models have only one converter, either integral with the exhaust manifold or in the exhaust system under the vehicle. The test equipment for a catalytic converter is expensive and highly sophisticated. If you suspect that the converter on your vehicle is malfunctioning, take it to a dealer service department or an authorized emissions inspection facility for diagnosis and repair. Trouble code readout may indicate some converter problems. Whenever the vehicle is raised for servicing of underbody components, check the converter for leaks, corrosion, dents and other damage. Check the welds/flange bolts that attach the front and rear ends of the converter to the exhaust system. If damage is discovered, the converter should be replaced. Converter replacement requires removal of the exhaust manifold or a portion of the exhaust system.