What does it mean when the engine indicator light comes on?

[MacElliott]

The reasons for the engine indicator light coming on include: 1. Poor combustion state: Inaccurate coordination between various components of the engine leads to poor combustion, causing the engine indicator light to illuminate; 2. Internal causes of engine fault light: Poor fuel quality or unclean engine cylinder interiors, severe carbon buildup can trigger the engine fault light; 3. Engine knocking: When engine knocking occurs, the engine indicator light will also illuminate. Generally, engine knocking is categorized into three scenarios: vehicle powerlessness, vehicle powerlessness accompanied by excessive engine noise, and obvious engine knocking sounds. If the vehicle only exhibits powerlessness, the engine indicator light may or may not illuminate, but in the latter two cases, the engine indicator light will come on.