What is the national emission standard for Euro IV plus OBD?
2 Answers
Euro IV plus OBD corresponds to China IV emission standard, which refers to the National Phase IV Motor Vehicle Pollutant Emission Standard. OBD stands for On-Board Diagnostics, and its functions include: 1. Locating and describing faults in specific parts or components to facilitate repairs; 2. Alerting when faults cause excessive emissions, indicating increased environmental impact from pollutant emissions. OBD includes: 1. EGR; 2. Engine; 3. Particulate filter; 4. Catalytic converter; 5. Oxygen sensor; 6. Emission control system; 7. Fuel system. The working principle of OBD: When an emission fault occurs, the ECU records the fault information and related codes, and notifies the driver by illuminating the malfunction indicator lamp or check engine light.
My over twenty years of driving experience tells me that the Euro IV emission standard, also known as Euro 4, directly corresponds to China's National IV emission standard, with the OBD system being a crucial part of it, specifically monitoring the exhaust pipe's tightness. China introduced the National IV standard around 2013, largely drawing from the Euro 4 framework, requiring all new vehicles to be equipped with OBD devices to detect fault lights and excessive emission signals. On Beijing roads, I often see older imported cars with Euro 4 labels, which are essentially National IV certifications—these are the details environmental bureaus check during vehicle inspections. When buying a used car or checking emission labels, pay close attention to this standard to avoid being misled, ensuring the engine operates properly, which also benefits urban air quality.
