What does it mean when the engine light comes on?

[StPiper]

The engine light coming on indicates: 1. Poor combustion state: The main reason for the engine light to illuminate is poor combustion state in the engine, caused by imprecise coordination between various engine components, leading to poor combustion and triggering the engine light; 2. Internal causes for engine light illumination: Poor fuel quality or unclean engine cylinders, severe carbon buildup can also cause the engine light to come on; 3. Engine knocking: When engine knocking occurs, the engine indicator light will also illuminate. Engine knocking is divided into two situations: the car lacking power with excessive engine noise and the engine having obvious knocking sounds. If the vehicle only shows a lack of power, the engine indicator light may or may not come on. In the latter two situations, the engine indicator light will illuminate.