Do National IV Vehicles Have Three-Way Catalytic Converters?

[Vivienne]

National IV vehicles are equipped with three-way catalytic converters. Below is relevant information about three-way catalytic converters: Working Principle: When high-temperature vehicle exhaust passes through the purification device, the purifying agents in the three-way catalytic converter enhance the activity of CO, HC, and NOx gases, promoting certain oxidation-reduction chemical reactions. CO is oxidized into colorless, non-toxic carbon dioxide gas at high temperatures; HC compounds are oxidized into water (H2O) and carbon dioxide; and NOx is reduced into nitrogen and oxygen. These three harmful gases are transformed into harmless gases, thereby purifying the vehicle exhaust. Maintenance Cycle: Typically, the three-way catalytic converter should be cleaned every 30,000 kilometers driven. It is also advisable to clean the three-way catalytic converter before the annual vehicle inspection to ensure smooth passage of the exhaust emission test.

[Roy]

From my understanding of automotive emission standards, China 4 compliant vehicles are definitely equipped with three-way catalytic converters, as they became mandatory for new vehicles around 2008. This device is installed in the exhaust pipe and works wonders by converting harmful emissions like carbon monoxide and hydrocarbons into carbon dioxide and water, making the exhaust cleaner. It uses precious metals such as platinum, palladium, and rhodium as catalysts, enabling highly efficient chemical reactions at high temperatures. If the catalytic converter fails over time—for example, due to clogging or contamination by impurities—the vehicle's power may decrease, the dashboard warning light may come on, and fuel consumption may increase. It's recommended to inspect the exhaust system every 50,000 to 60,000 kilometers, use high-quality gasoline to avoid poisoning the catalytic converter, and not skimp on costs. This way, driving produces fewer emissions, benefits the environment, and avoids unnecessary headaches, as the China 4 standard requires this configuration for compliance.

[DiKing]

I once drove a 2010 used car with China IV emission standard, which was indeed equipped with a catalytic converter. This device plays a significant role in treating the emitted pollutants, making the exhaust smell noticeably less pungent. After several years of use, during a routine maintenance check, the mechanic pointed out that the converter's efficiency had declined, likely due to carbon buildup or clogging from low-quality fuel. He recommended using cleaning additives or replacing it if necessary. From my own observations, avoiding frequent short trips with cold starts and allowing the engine to warm up properly before driving can help it function better. In terms of cost, replacing it can range from a few hundred to several thousand yuan, but proper maintenance not only extends the vehicle's lifespan but also saves fuel and money, while ensuring compliance with environmental standards for peace of mind.

[EmmaLynn]

China IV vehicles are generally equipped with a three-way catalytic converter. This device processes harmful gases in the exhaust, such as carbon monoxide or nitrogen oxides, converting them into harmless substances to reduce pollution. Since the implementation of the China IV emission standards in 2008, new vehicles have been required to install it. Its function is to purify the exhaust system through catalytic reactions. When using it, pay attention to the quality of gasoline to avoid impurities damaging it. Common issues include blockage or reduced efficiency, which may trigger the malfunction indicator light, requiring timely inspection and repair. In short, with it, emissions meet the standards, benefiting the environment.

[LucasMarie]

The three-way catalytic converter is a standard feature in National IV compliant vehicles, requiring extra attention in maintenance. Based on my experience, its function is to convert exhaust pollutants into carbon dioxide and water, but over time, carbon buildup or contamination can lead to failure. I remind myself to avoid using low-quality fuel and periodically rev the engine at high speeds to clear carbon deposits. If the OBD system alerts a catalytic converter fault, it might be clogged and require professional cleaning or replacement; costs can range from a few hundred to tens of thousands depending on the vehicle model. Maintaining good driving habits, such as avoiding prolonged idling, can extend its lifespan, which is crucial for reducing excessive vehicle emissions.