Changan Xiao Ye fault optical code air intake fault and then the convex shaft is abnormal.

Fault cause lamp:

1. Poor gasoline quality will lead to insufficient combustion of the mixture in the cylinder, which will lead to lamp pollution and carbon deposition.

2. The existence of carbon deposits at the air inlet and piston top will lead to poor atomization, resulting in insufficient combustion and pollution of lights.

3. When the cold car starts, especially when the weather temperature drops sharply, the pollution lamp will light up due to the temperature correction problem of the computer, but as long as the temperature drops to a certain temperature, it will be relatively stable without fluctuation.

4. If the mileage of the engine is too long, the working characteristics of the spark plug will be weakened, leading to the lighting of the pollution lamp.

5. Too much carbon deposit makes ignition difficult, which will lead to reverse breakdown of the ignition coil, resulting in poor ignition and incomplete combustion, which will pollute the lamp. A notable feature of this phenomenon is that when the ignition coil fails, the engine always shakes violently. If it is not shaken violently all the time, the ignition coil can be basically eliminated.

6. Excessive vehicle age and mechanical aging lead to poor engine working conditions, poor combustion and ignition, and light pollution.

7. Some sensor computer boards are faulty, which leads to the pollution of lights.

8. Wait, there are many reasons for the pollution lights, but the first three are the most.

Special note: When the pollution light is on, the engine will not shake or slightly shake. At this time, the owner does not need to worry when using it, and can use it normally. Sometimes it's convenient to go to 4S for inspection.