How to Clean the Three-Way Catalytic Converter of a Sedan?
4 Answers
The cleaning methods for the three-way catalytic converter of a sedan are: 1. Use oxalic acid solution for cleaning, which has a very noticeable effect. However, this method requires disassembling the three-way catalytic converter, and there are certain requirements for the mixing ratio of the oxalic acid solution and the soaking time. Improper use may damage the internal structure. 2. No-disassembly cleaning, which involves using an IV drip or adding a cleaning agent to the fuel tank, but this method is not as effective as the first one and is suitable for minor blockages of the three-way catalytic converter. The three-way catalytic converter has a usage cycle, and the length of its service life is closely related to the quality of the fuel. If the fuel quality is poor and combustion is incomplete, many compounds will adhere to the surface of the three-way catalytic converter. Over time, this can cause the three-way catalytic converter to become poisoned and lose its purification function.
Last time my car's catalytic converter was clogged, and it failed the emissions test. I used a catalytic cleaner additive in the fuel tank, filled up with gas, and then drove on the highway at high RPM for about half an hour. This method helps dissolve internal carbon deposits and improves exhaust emissions. The catalytic converter is a crucial component for filtering pollutants from engine exhaust. If left uncleaned for a long time, it can lead to reduced power and lower fuel efficiency. I recommend performing preventive cleaning every 10,000 to 20,000 kilometers and using high-quality gasoline to minimize clogging. If the problem is severe—such as the car not starting or the check engine light turning on—it’s best to take it to a professional repair shop for proper handling to avoid damaging the ceramic substrate by DIY disassembly. This maintenance approach saves money, ensures safety, and extends the vehicle's lifespan.
I have some experience in car maintenance. A simple method to clean the catalytic converter is by using fuel additives. Many brands on the market, such as 3M catalytic cleaner, are effective. Just add it to the fuel tank according to the instructions, then drive to let it circulate and clean the system. Additionally, driving at high speeds to increase engine RPM can help burn off some accumulated deposits, but don't expect it to completely unclog. The catalytic converter is delicate, made of fragile ceramic material, and attempting to disassemble and clean it yourself carries high risks—it's easy to damage and expensive to replace. If you have exhaust issues, it's best to first check if the oxygen sensor is functioning properly before deciding to clean the converter. Regularly avoiding prolonged low-speed driving can reduce carbon buildup and help keep this environmental component functioning normally.
A cost-effective way to clean the catalytic converter is by using additives. I often buy bottled catalytic cleaner and pour it into the fuel tank, then drive on the highway for about half an hour to see results. This works well for mild clogs, being both convenient and reducing repair costs. The catalytic converter helps reduce exhaust pollution, and maintaining it can save fuel and extend its lifespan. Prevention is more important: use high-quality gasoline and change the oil regularly to avoid impurity buildup. If severe clogging occurs, don't attempt to remove it yourself; seek professional service. The whole process is simple and quick, making it suitable for everyday drivers.
