If your mechanic tells you that you catalytic converter needs replaced, contact your local dealer. Catalytic converters are covered under factory warranty for most makes and models for 8 years or 80,000 miles. Doing this could save you hundreds and in some cases, thousands of dollars.
What is a Catalytic converter? It is a device incorporated in the exhaust system of a motor vehicle, containing a catalyst for converting pollutant gases into less harmful ones.