* Engine misfires: Engine misfires can cause unburned fuel to enter the exhaust system, which can damage the catalytic converter by overheating it.
* Coolant leaks: Coolant leaks can cause the catalytic converter to overheat, which can damage the catalyst and render the converter ineffective.
* Mechanical damage: Mechanical damage to the catalytic converter, such as a cracked or broken housing, can allow exhaust gases to bypass the converter and reduce its efficiency.
