A catalytic converter warranty is a minimum of either eight years or 80,000 miles, depending which comes first. This minimum requirement is regulated by the federal government.
The Federal Emission Warranty was established to ensure vehicles meet Environmental Protection Agency standards. The warranty covers manufacturer's defects related to either workmanship or the materials used in making the catalytic converter and the rest of the emissions system. To take advantage of this warranty, the car's owner must take the vehicle with the affected catalytic converter to an authorized service center. Most of the other parts of a car's emissions system are covered under the warranty for only two years or 24,000 miles.