Replacing a catalytic converter is an essential part of maintaining your vehicle's emissions performance and can be an expensive repair if not covered by the manufacturer. Fortunately, if your car is less than eight years old with fewer than 80,000 miles, it may still be under the Federal emissions warranty provided by the vehicle's manufacturer. This means that you could be eligible for a free replacement catalytic converter. To confirm your eligibility, you should contact the service department of the local new-car dealer that carries the same brand as your vehicle.