How to Thoroughly Clean a Three-Way Catalytic Converter?

[OWeston]

The most effective method to clean a three-way catalytic converter is to completely remove it from the vehicle, soak it in a cleaning agent (such as oxalic acid or toilet cleaner) for a period of time, and then rinse it with clean water. In addition, there are other cleaning methods for the three-way catalytic converter, as detailed below: 1. Adding a cleaning agent to the car's fuel tank: The biggest advantage of this method is its low cost and simplicity. You only need to add the cleaning agent directly to the fuel tank. However, such products have minimal cleaning effect on the three-way catalytic converter because they are almost completely burned out by the time they reach the converter after combustion in the engine. 2. Using a drip cleaning method: Also known as no-disassembly cleaning, this method's biggest advantage is that it does not require removing the three-way catalytic converter. The downside is the high cost of purchasing the cleaning equipment, and the cleaning effect is not guaranteed to be good.

[DiArya]

To thoroughly clean the three-way catalytic converter, I recommend removing it for treatment. Leaving it in place only allows surface cleaning, which can't deeply remove blockages. When working on it, first safely lift the vehicle, disconnect the battery, and remove the exhaust pipe and oxygen sensor. Carefully take out the catalytic converter, being cautious not to damage the ceramic inner liner. Soak it in a dedicated catalytic cleaner for about half an hour to dissolve carbon deposits, then rinse thoroughly with water pressure. It must be completely dry before reinstalling, as moisture can damage it. The entire process requires specialized tools like wrenches and protective gloves. A thorough cleaning can restore performance well, avoiding the cost of replacing a new part. When driving normally, pay attention to using high-quality fuel and avoid inferior fuels to reduce deposits. DIY can save money, but if you lack experience, the risks are high. A damaged catalytic converter may affect the safety of the entire vehicle's exhaust system. Remember to work in a ventilated environment and avoid inhaling harmful fumes from the cleaning agent.

[DeTimothy]

Thoroughly cleaning the catalytic converter requires safety first—never act recklessly. I once experienced a clogged converter with foul exhaust odors, and attempting a DIY cleaning only caused more problems. Using improper chemicals led to the internal honeycomb structure cracking. Catalytic converters contain harmful substances like lead, and improper handling can pollute the environment or even cause poisoning. For a thorough clean, it’s best left to professional repair shops equipped with high-temperature steam or ultrasonic devices to safely remove all carbon buildup. If you insist on DIY, ensure you read the vehicle manual and prepare full protective gear, such as masks and thick gloves. Severe long-term carbon buildup may require replacement, as cleaning is only a temporary fix. Maintain the engine with regular oil changes to prevent impurity buildup and avoid issues. Incorrect cleaning can trigger emission system failures, increasing repair costs—hardly worth the risk.

[JuliannaFitz]

I've tried the method of using automotive additives for a completely clogged catalytic converter. Before refueling, pour in a bottle of catalytic converter-specific cleaner and drive for several dozen kilometers to partially dissolve and expel the carbon deposits. It's simple, time-saving, and doesn't require disassembly, making it suitable for minor blockages. However, the effect is limited and cannot deeply remove all issues. For a thorough cleaning, it still needs to be removed and chemically soaked. Don't use additive cleaners too frequently to avoid affecting the fuel system's operation. Normally, driving with high-quality fuel can reduce deposits and prevent clogging.