What is the purpose of cleaning the car's three-way catalytic converter?
3 Answers
Cleaning the three-way catalytic converter not only helps improve the performance of the vehicle's engine but also reduces frequent alarms from the exhaust system's oxygen sensor. The cleaning cycle for the three-way catalytic converter: 1. Typically, it needs to be cleaned every 30,000 kilometers driven. 2. When you notice increased fuel consumption or reduced power in the vehicle, it's necessary to check and clean the three-way catalytic converter as needed. 3. Every time the vehicle undergoes cleaning of the fuel injectors, throttle valve, and intake tract maintenance, the three-way catalytic converter should also be cleaned. 4. It's best to clean the three-way catalytic converter before the annual exhaust emission test, otherwise, the vehicle may not pass.
Cleaning the catalytic converter primarily restores its function of purifying exhaust gases. Over time, a significant amount of carbon deposits and lead-sulfur compounds accumulate inside the converter, much like rust clogging a water pipe. After cleaning, the honeycomb-like small channels become unblocked, allowing exhaust gases to pass smoothly through the catalytic coating, converting harmful carbon monoxide and hydrocarbons into harmless water and carbon dioxide. An added benefit of smooth exhaust flow is that the car drives more effortlessly, as the engine doesn't have to work hard to expel exhaust gases. Additionally, it makes passing emissions tests during annual inspections easier, saving the hassle of repeated checks. Personally, I clean it every 40,000 kilometers. This maintenance approach saves thousands compared to replacing the catalytic converter and also extends its lifespan.
In my opinion, the most practical benefit of cleaning the three-way catalytic converter is saving money while being eco-friendly. When it gets clogged, the exhaust purification efficiency drops significantly, making it impossible to pass emissions tests, and you'd end up wasting money on annual inspections. Cleaning it restores its ability to convert nitrogen oxides and unburned gasoline molecules in the exhaust. A bonus effect of smoother exhaust flow is that I clearly noticed the engine sound becoming lighter and throttle response more direct. Do the math: replacing an OEM catalytic converter costs 4,000-5,000 RMB, while spending a few hundred on cleaning to extend its life by 2-3 years is a great deal. Those old cars you see spewing black smoke on the road? Mostly caused by failed catalytic converters that weren't addressed in time.
