Firstly, it can be said that there are several reasons why the engine malfunction light is on,

Firstly, due to poor fuel quality, the combustion state is poor, causing the engine malfunction light to turn on;

Secondly, due to malfunctions in the electronic control system or some mechanical components of the engine, the normal operation of the engine cannot be guaranteed, such as damage to spark plugs, sensors, actuators, and even the engine control unit. This will result in weak acceleration of the vehicle and cause the engine malfunction light to turn on;

Thirdly, the cylinders inside the vehicle's engine are dirty or have a lot of carbon deposits. Carbon deposits have strong adsorption properties and can adsorb fuel particles from the mixture, affecting the normal operation of the engine and causing the engine malfunction light to turn on.

In general, when encountering the situation where the engine light is on, the fuel problem can be eliminated by adding fuel additives recommended by the manufacturer or replacing the fuel. If the fault still persists, the engine intake system can be cleaned again. After eliminating the above two reasons, if the engine fault light still stays on, it is very likely that the vehicle has a fault with the engine and needs to be monitored and repaired at a repair station. The specific fault needs to be decoded by a dedicated diagnostic instrument before it can be viewed. Based on the analyzed fault cause, the faulty parts can be replaced to restore the normal working state of the engine, and then the fault light alarm of the engine can be cleared.