How Often Should the Three-Way Catalytic Converter Be Serviced on a Corolla Hybrid?
1 Answers
Generally, the three-way catalytic converter should be cleaned when the vehicle has traveled 20,000 to 30,000 kilometers. The cleaning frequency should be based on the actual driving conditions. If the vehicle experiences poor exhaust emissions or insufficient power even after cleaning the throttle and fuel injectors, it may indicate a clogged three-way catalytic converter, requiring prompt inspection and cleaning. How to Determine the Condition of the Three-Way Catalytic Converter: Visual Inspection. Check the exterior of the three-way catalytic converter for damage or stains. Scratches, cracks, or other visible damage may indicate prior harm. If there are noticeable gray spots in the center of the converter's protective cover, severe discoloration, or purple marks on the shell, it may suggest overheating issues. Examine Engine Exhaust Conditions. Place your hand near the exhaust pipe outlet to feel the exhaust flow and check for blockages or poor exhaust flow. Another method is to open the air filter, remove the filter element, and observe if exhaust gas flows backward during rapid acceleration, indicating poor exhaust flow. To assess the TWC's condition, also check for faults in the secondary air injection pump. Use an Infrared Thermometer for Evaluation. Compare the temperature difference between the inlet and outlet of the TWC using an infrared thermometer. If the temperature difference is less than 10°C, the TWC is likely damaged.
