Why doesn't the engine light illuminate during power-on self-test?

[SanClaire]

It is normal for the engine light not to illuminate during power-on self-test, because the engine light will always come on when the car is not started, and it will automatically turn off 3-5 seconds after starting. The engine self-test light, also known as the engine fault light, will illuminate on the dashboard when the ECU reads fault codes generated by engine malfunctions. Additional information: 1. If the engine fault light stays on while driving, it usually indicates an engine malfunction. 2. Possible causes: The engine fault light typically illuminates due to issues in the fuel emission system. When the fault light is on, try starting and turning off the vehicle three times, then observe whether the fault light remains illuminated. If it does, promptly take the vehicle to a repair shop for inspection.