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What does it mean when a vehicle exceeds emission limits?

1 Answers

Gomes

07/30/25 6:47am

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.

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