What is the method for cleaning a three-way catalytic converter?

[VonAubrey]

Here are the methods for cleaning a three-way catalytic converter: 1. Add cleaning agent to the fuel tank. The advantage is that it is inexpensive and easy to operate, as you only need to add this type of cleaning agent directly to the fuel tank. However, the cleaning effect of such products on the three-way catalytic converter is minimal. 2. Drip cleaning. Drip cleaning is also known as no-disassembly cleaning. The advantage is that it does not require disassembling the three-way catalytic converter, but the disadvantage is that the cost of purchasing cleaning equipment is high, and the cleaning effect is not ideal. Extended information: The principle of cleaning a three-way catalytic converter is to create a high-temperature oxidation environment inside the three-way catalytic converter by drawing the cleaning agent into the combustion chamber through the intake vacuum suction and burning it. This achieves the purpose of restoring the activity of the rare metals on the three-way catalytic converter through redox reactions.

[ReaganLee]

Last time my old car's check engine light came on, the 4S shop said the catalytic converter was clogged and wanted me to spend 2,000 to replace it. I figured I'd try cleaning it first, so I bought a special cleaner. The process was actually simple: after warming up the engine, pour the cleaner into the fuel tank and run through a full tank of gas—the exhaust smell was really strong! After a highway run, I noticed the throttle felt lighter. But I must remind everyone, this trick only works for minor clogs; if the ceramic substrate inside the converter is broken, you'll still need a new one. For regular maintenance, remember not to use low-quality gas from shady stations—that stuff clogs catalytic converters like crazy.

[DelClaire]

I've seen mechanics at auto repair shops using a no-disassembly cleaning machine to treat the catalytic converter. The device is connected to the oxygen sensor port, and while the engine is running, a specialized cleaning solution is atomized and sprayed in. The mechanic revs the engine to let the high-temperature exhaust flush the system. The whole process takes about half an hour and costs around 300 yuan, which is much cheaper than replacing the part. This method can unclog the micro-pores of the catalyst and restore its activity, but it can't remove completely sintered carbon deposits. It's recommended to clean it every 30,000 kilometers to prevent clogging, especially for vehicles that frequently drive in urban areas, as they are more prone to blockage.

[AdamFitz]

Veteran driver's advice: High-speed driving to clean carbon deposits is not just a myth. Last week, my car failed the annual emission test. I added two bottles of catalytic converter cleaner and went on a long-distance drive. Maintaining a speed of 80 km/h at 3000 RPM allowed the exhaust temperature to reach 700°C. After driving 200 km, the retest passed. The key is to use specialized cleaner—regular fuel additives are much less effective. The castor oil component in the cleaner softens carbon deposits, which are then blown away by the high-temperature exhaust.

[McJustin]

The most thorough cleaning effect is achieved but it's very time-consuming. My friend's repair shop has done this job: removing the exhaust pipe and soaking the catalytic converter in oxalic acid solution, then using ultrasonic vibration for two hours. The black water washed out contains shiny precious metal powder, no wonder new catalytic converters are so expensive. However, you need to find a reliable shop, as reassembly with air leaks is even more troublesome. Soaking and washing can restore about 90% of the effectiveness, costing around eight hundred. Suitable for catalytic converters that have been declared dead by repair shops to give it a try.

[DiRobert]

Prevention is more important than cleaning. I adhere to three methods: always use genuine air filters during maintenance to prevent dust from clogging the carrier; only refuel at reputable major gas stations; and take a monthly highway drive to allow the catalytic converter to fully burn. If you notice a drop in power, don’t rush to replace it—first use a diagnostic tool to read the air-fuel ratio data stream. If the front oxygen sensor voltage fluctuates more than the rear one, it’s likely clogged. Cleaning at this stage is still effective. Waiting until the fault light comes on may mean the ceramic carrier has already sintered due to high temperatures, leaving replacement as the only option.