How often should the catalytic converter system of a sedan be cleaned?
3 Answers
The catalytic converter system of a sedan is recommended to be cleaned every 20,000-30,000 kilometers or once a year using a non-dismantling cleaning method. Catalytic Converter Cleaner: Catalytic converter cleaner can simultaneously clean the engine's intake system, combustion system, and exhaust system. It effectively, quickly, and efficiently removes carbon deposits in the intake tract and combustion chamber, as well as chemical complexes attached to the oxygen sensor and catalytic converter. Precautions: Cars equipped with catalytic converters should not use leaded gasoline. When leaded gasoline burns, lead particles are expelled with the exhaust gases and pass through the catalytic converter, covering the surface of the catalyst. This reduces the effective area of the catalyst, significantly decreasing the conversion efficiency of the converter and leading to lead poisoning of the catalytic converter.
I've been driving a sedan for over a decade, and I've always felt there's no fixed schedule for catalytic converter cleaning. It's more about the car's condition. If you notice sluggish acceleration or the engine light keeps flashing, it might be clogged and need cleaning. I usually check the exhaust system every 50,000 to 60,000 kilometers, often adding a fuel system cleaner to the tank and running on the highway to automatically clean the pipes. If that doesn't work, then I take it to a shop for professional cleaning. After cleaning, emissions are noticeably cleaner, passing tailpipe tests easily and even saving a bit on fuel. Using genuine gasoline helps avoid rapid carbon buildup from low-quality fuel, and city driving with frequent traffic jams can dirty the converter faster. Cleaning frequency varies by person—for someone like me who doesn't drive long distances often, I recommend checking every three to four years, rather than waiting until a major issue arises.
I always pay attention to environmental protection when driving. Cleaning the three-way catalytic converter helps reduce emissions and protect the air. There's no absolute frequency for cleaning—if there are no symptoms like unusual exhaust smells or normal fuel consumption, there's no urgency. However, it's safer to check it every 60,000 to 70,000 kilometers. I make it a habit to do it regularly because cleaning can extend the catalytic converter's lifespan, save on replacement costs, and reduce pollution. Adding a dedicated cleaning agent and driving on the highway is simple and effective; if that doesn't work, then visit a repair shop. Driving conditions also matter—frequent city traffic jams lead to faster carbon buildup in the catalytic converter, unlike those who drive more on highways, where it's easier for the system to self-clean. Overall, after cleaning, the car's emissions meet standards, making it easier to pass annual inspections. It's a practical investment—don't skimp on small expenses.
