What Does It Mean When the Engine Fault Light Comes On?

[DiDawson]

When the engine fault light comes on, it indicates issues such as sensor malfunction, poor combustion state, or carbon buildup inside the engine. Below are the common causes for the engine fault light illuminating. Poor Combustion State: A poor combustion state is the primary reason for the engine fault light to come on. In automotive design, to ensure the engine operates in good condition and maintains a normal working lifespan, oxygen sensors are installed to monitor the engine's combustion state. If the combustion state is poor, it not only pollutes the environment but also leads to fuel wastage and excessive engine wear. Poor Fuel Quality: Many drivers who notice the engine fault light coming on share a common experience: the light suddenly illuminates after refueling with a new tank of gas. This is because engines have specific requirements for fuel quality, especially as regulations increasingly demand higher performance from engines, thus raising the standards for fuel quality. In reality, some gas stations fail to fully comply with these standards and provide fuel that meets the requirements of high-performance engines, leading to frequent occurrences of the engine fault light coming on.