What Causes the Engine Shutdown Indicator Light to Illuminate?

[McCamilla]

The engine warning light is used to display the working status of the engine, primarily in yellow. When turning the key and the vehicle performs a self-check, this indicator light will also illuminate. After the car starts normally, the indicator light will automatically turn off. If the indicator light remains on after starting the car, it may indicate a potential fault in the engine system. If the engine warning light illuminates for a few seconds and then the vehicle shuts down normally, this is part of the car's computer self-check and is a normal phenomenon that does not require repair. If the engine warning light does not turn off after starting the car, or if the warning light suddenly illuminates or flashes while driving, the possible reasons include the following: substandard fuel quality. If the engine warning light comes on shortly after refueling, it is likely due to incomplete combustion caused by poor-quality gasoline, triggering the engine warning light. Spark plug carbon buildup or prolonged use of spark plugs can lead to poor engine performance, resulting in difficulties starting, unstable idling, poor idle quality, backfiring during rapid acceleration, excessive exhaust emissions, etc., which can also cause the engine warning light to illuminate. Additionally, faults in the oxygen sensor, knock sensor, or other engine electronic control systems can also trigger the engine warning light.