What are the reasons for the post-processing fault light of China V emission standard to illuminate?

[StGenevieve]

Electronic throttle is dirty, cleaning the throttle can solve the problem. Below is relevant information: 1. Identification: The China V emission standard is marked with "V" using Roman numerals. 2. Emission levels: For gasoline vehicles under the China V standard, carbon monoxide emissions are 1000 mg/km. Compared to the China IV standard, the sulfur content in China V standard gasoline is reduced by 80%. Taking cars with the same displacement as an example, the sulfur dioxide emissions from 5 cars using China V standard are equivalent to that from 1 car using China IV standard fuel. Compared to the China IV standard, the new China V standard can reduce nitrogen oxide emissions by 25% for light-duty vehicles and by 43% for heavy-duty vehicles.