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Does a Deteriorated Three-Way Catalytic Converter Affect the Vehicle?

1 Answers

MacCarter

07/30/25 9:54am

A deteriorated three-way catalytic converter not only significantly increases fuel consumption, reduces power output, and causes exhaust emissions to exceed standards, but in more severe cases, it can cause the exhaust pipe to glow red-hot, potentially leading to vehicle self-ignition. For a long time, auto repair shops have lacked effective preventive measures or treatment methods for a deteriorated three-way catalytic converter. The only solution for a deteriorated catalytic converter is replacement. How to determine the condition of a three-way catalytic converter: Visual inspection. Check the exterior of the three-way catalytic converter for any damage or discoloration. If there are scratches, cracks, or other visible damage, it is likely that the catalytic converter has been compromised. If there are noticeable gray spots in the center of the converter's protective cover, severe discoloration spots, or purple marks on the shell, the catalytic converter may have suffered from overheating. Check the engine's exhaust condition. Place your hand near the exhaust pipe outlet to feel the exhaust flow and check whether the catalytic converter is clogged or if there is restricted exhaust flow. Another method is to open the air filter, remove the filter element, and observe whether exhaust gas flows backward during rapid acceleration, indicating restricted exhaust flow. To assess the condition of the TWC (Three-Way Catalyst), also check whether the secondary air injection pump is functioning properly. Use an infrared thermometer for judgment. Compare the temperature difference between the front and rear of the TWC using an infrared thermometer. If the temperature difference between the inlet and outlet of the catalytic converter is less than 10°C, the TWC is likely damaged.

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