What is the reason for the engine fault light being on when the car is not started?

[VonLevi]

When the engine fault light is on while the car is not started, it is part of the vehicle's normal self-check, indicating that the engine is not yet operational. Before the car is ignited, it enters a self-check state, during which the engine fault light will illuminate. Once the car is started normally, the light will turn off. If the engine fault light remains on after the car is started, it indicates an issue with the engine's operational status. An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, and electric motors. The term engine can refer to both the power-generating device and the entire machine, including the power unit.