What does it mean when a vehicle exceeds emission limits?
2 Answers
Emission limit exceedance is detected by certain roadside monitoring equipment. This situation may occur due to the use of poor-quality gasoline, prolonged failure to change engine oil affecting engine performance, or damage to certain engine sensors. More details about emission limit exceedance are as follows: 1. Three-way catalytic converter: The exhaust manifold of a car engine is equipped with a three-way catalytic converter, which purifies pollutants in the exhaust. Long-term use of the three-way catalytic converter can lead to malfunctions, resulting in excessive pollutants in the exhaust. 2. Oxygen sensor: Most vehicles are equipped with two oxygen sensors, one located behind the exhaust manifold and the other behind the three-way catalytic converter. The oxygen sensor monitors the oxygen content in the exhaust and sends feedback signals to the ECU, allowing the ECU to adjust the air-fuel ratio. If the oxygen sensor is damaged, it cannot send feedback signals to the ECU.
Excessive vehicle emissions mean that the pollutants in the vehicle's exhaust, such as carbon monoxide or nitrogen oxides, exceed the national standard limits. High emissions can easily pollute the air. From an environmental protection perspective, this is a major issue. Excessive exhaust emissions can worsen urban air quality, exacerbate smog, and even contribute to global warming. The government has set standards like China VI, and vehicles that exceed these limits will fail annual inspections and may face fines or driving restrictions. There are many reasons for this, such as a faulty catalytic converter or severe carbon buildup. To prevent it, regular vehicle maintenance, cleaning fuel injectors, checking engine performance, reducing idling and aggressive acceleration habits can help protect the environment and maintain vehicle condition.
