What Does It Mean When the Engine Light Comes On?

[Jan]

When the engine light on the dashboard comes on, it can be divided into two situations: 1. The engine fault light comes on for a few seconds and then turns off after the car starts. This is the car's computer self-check, a normal phenomenon that does not require repair. 2. The engine fault light does not turn off after the car starts, or the fault light suddenly comes on or flashes while driving. For the second situation, the reasons may include the following: 1. The fuel quality does not meet standards. If the engine fault light comes on shortly after refueling, it is likely due to incomplete combustion caused by substandard fuel, which triggers the engine fault light. 2. Carbon buildup on the spark plugs or prolonged use of spark plugs can lead to poor engine performance, resulting in difficulties starting, unstable idling, poor idling, backfiring during acceleration, excessive exhaust emissions, etc., which can also cause the engine fault light to come on. 3. Faulty oxygen sensors, knock sensors, or other engine electronic control system issues can also trigger the engine fault light.