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What Causes the Engine Warning Light to Illuminate After Replacing the Catalytic Converter?

1 Answers

DeEva

07/30/25 7:20am

If the oxygen sensor is not the issue, then the catalytic converter you replaced may be defective. You can try replacing it again. However, in most cases, the problem is caused by the oxygen sensor. How to Determine the Condition of the Catalytic Converter: Visual Inspection. Examine the exterior of the catalytic converter for any damage or discoloration. If there are scratches, cracks, or other visible damage, the catalytic converter may have been compromised. If there are noticeable gray spots in the center of the converter's protective shield, severe discoloration, or purple marks on the casing, it could indicate overheating issues. Check the Engine Exhaust. Place your hand near the exhaust pipe outlet to feel the exhaust flow. This helps determine if the catalytic converter is clogged or if there are exhaust flow issues. Another method is to open the air filter, remove the filter element, and check for exhaust backflow during rapid acceleration. If backflow occurs, the engine may have restricted exhaust flow. To assess the TWC (Three-Way Catalytic Converter), also inspect the secondary air injection pump for faults. Use an Infrared Thermometer. Compare the temperature difference before and after the TWC using an infrared thermometer. If the temperature difference between the inlet and outlet of the catalytic converter is less than 10°C (18°F), the TWC is likely damaged.

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