Hello, I saw your question: "Why did Lan Se Wing God check the engine fault light?" . I wonder if you solved it? I have the same problem.

I have the same question:

The first time was in winter. In January, there was no train for half a month, so it was difficult to start. After several efforts, the train finally stopped, but the engine light was on. I ran 40 kilometers to the service station, stopped the train, queued up, and then stopped. Nothing for the next six months.

The second time was in spring. In May, I cleaned the accelerator myself, and the engine light came on after washing. I ran dozens of kilometers the next day, just wait for the car to turn off for a few hours.

Doubt:

For the first time, because of the cold weather, I didn't start the car for half a month, so I didn't supply oil when I got on the bus, and ecu automatically adjusted the fuel ratio. As a result, the fuel was supplied after the car started, and the ecu adjusted it a little slowly, and the fuel supply was too high, which led to insufficient combustion, even being discharged before combustion, which further interfered with the normal work of the oxygen sensor and eventually led to the long light of the engine. However, after running for dozens of kilometers, the temperature rises, the ecu is adjusted to normal working state, the temperature and humidity in the exhaust pipe are normal, and the influence of incomplete fuel combustion on the oxygen sensor is eliminated and returned to normal.

The second time, because of cleaning the throttle, the air inlet must be removed. Removing the air inlet will destroy the car, because there is a sensor at the air inlet bellows, and removing the sensor above the air inlet will detect the wrong signal. If the engine is lifted to more than 4000 rpm, it will cause ecu to generate wrong signals and fuel supply confusion. In addition, the cleaning agent injected into the throttle valve will cause abnormal combustion of the cylinder, and the exhaust gas will interfere with the oxygen sensor, causing it to work abnormally, and then the engine light will be on for a long time. Therefore, after running for dozens of kilometers, the ecu is adjusted to the normal state, and all the cleaning agent residues and fuel residues in the exhaust pipe are discharged, eliminating the influence on the oxygen sensor and returning to normal.

Conclusion:

There is a problem with the cooperation between the oxygen sensor and ecu, but it will not affect the car, and the hardware is fine.

Reminder:

Do not change the accessories of the service station at will, and do not change them at will during the warranty period. Unless there is a real hardware problem that needs to be replaced, don't let the service station try the accessories and finally find out what the problem is. Then it will become the original parts instead of the original car parts.