Why Does the Engine Fault Light Illuminate When the Car Is Not Started?

[LeilaRose]

It is normal for the engine fault light to illuminate when the engine is not started. After powering on but before ignition, the onboard computer begins its diagnostic checks. At this stage, it detects that the engine is not running, which causes the engine light to illuminate. Once the engine is started and running normally, the light will turn off after another diagnostic check. Here is more information about the engine fault light: 1. If the engine fault light comes on, first check if there is an issue with the sensors. If the sensors are functioning properly, the most common cause is carbon buildup. 2. Carbon buildup in a car is quite normal, and regular cleaning is necessary to better protect the vehicle and extend the engine's lifespan.