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Is it absolutely necessary to replace a bad catalytic converter or can car run on one?

While a car can technically run on a bad catalytic converter, it is not advisable to do so for several reasons:

Environmental Issues:

- A bad catalytic converter fails to effectively convert harmful pollutants like carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) into less harmful substances. This can lead to increased air pollution, contributing to poor air quality and potential health risks.

Engine Performance:

- A faulty catalytic converter can cause reduced engine performance and fuel efficiency. The inefficient conversion of pollutants can result in a decrease in engine power and an increase in fuel consumption.

Emissions Testing Failure:

- Many countries and states have stringent emissions regulations, and a car with a bad catalytic converter may fail emissions testing. This can result in fines or the inability to register or renew the vehicle's registration.

Further Damage:

- Driving with a bad catalytic converter can cause additional damage to the vehicle's exhaust system. The increased heat and unburned fuel can deteriorate other components, such as the oxygen sensors, exhaust manifold, and muffler.

Safety Concerns:

- A faulty catalytic converter can cause overheating, which in severe cases can lead to engine fires or other safety hazards.

Therefore, although a car can run on a bad catalytic converter, it is strongly recommended to replace it promptly to maintain optimal performance, minimize emissions, ensure environmental compliance, and prevent further damage to the vehicle.