When your Plymouth catalytic converter fails, it is usually not due to the design or engineering failure. Instead, a catalytic converter usually dies because of the failure of another component in the exhaust or combustion system. A catalytic converter should last at least 100,000 miles and frequently, it will outlast the lifespan of a car. But if the catalytic converter is mistreated by an owner accidentally using leaded fuel, it will stop functioning. When coolant and oil get into the exhaust stream and end up in the catalytic converter, the residue will block the air channels. When too much unburned fuel is leaked into the exhaust system, the catalytic converter will suffer from heat stress. The heat is caused by ignition of the unburned fuel when it reaches the hot catalytic converter core. The unburned fuel is sent to the exhaust system during misfires. Or, if the Electronic Control Module receives incorrect information from its sensors, it will instruct the fuel injectors to send too much fuel to the combustion chamber. As the catalytic converter fails, you will notice your fuel mileage dropping because of the unburned fuel that is wasted. A warning light will appear in your dashboard, and you might sense some hesitation when you attempt to accelerate. When you take your car in for an emissions test, it fails. At that point, you must diagnose what caused the catalytic converter to fail, and address the malfunction. Then, order a quality Plymouth catalytic converter from our site and be assured that the newly installed unit will handle the heat and pressure of the exhaust system.