What is the yellow light on the dashboard of a car?

The engine fault light usually comes on because:

Poor combustion state or poor fuel quality;

The inside of the engine cylinder is not clean and there is carbon deposit;

The computer can't get engine data.

When the engine fault light is on, it is recommended to check the water thermometer and the oil pressure alarm light first. If these two lights also give an alarm at this time, it means that the engine is indeed faulty. Please stop the car in time and call for road rescue.