What are the reasons for the engine icon on the dashboard to light up?

[DonovanAnn]

The reasons for the engine icon on the dashboard to light up include sensor issues, maintenance problems, and fuel quality issues. Sensor Issues: The sensors mentioned here include those for coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the car's ECU cannot accurately obtain engine data, which will then trigger the engine fault light. Maintenance Problems: Poor engine maintenance is the most common cause of the engine fault light turning on. Vehicles have specific maintenance cycles, and if the driver does not adhere to these cycles, combined with poor driving habits, it will increase the burden on the engine's operation, eventually leading to the fault light as a warning. Fuel Quality Issues: The fuel quality referred to here includes both fuel and engine oil. The fuel added to a car usually has a specific grade, and engine oil can be either semi-synthetic or fully synthetic. Manufacturers generally recommend which grade of fuel and which type of engine oil the driver should use. If the driver does not follow these recommendations, it can lead to engine wear over time.