What are the possible causes for the engine light to turn on?

[DeGabriela]

Engine light may illuminate due to the following reasons: 1. Sensor issues: The sensors mentioned here include water temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or signal interruption occurs, the vehicle's ECU cannot accurately obtain engine data, which will then trigger the engine fault light. 2. Maintenance issues: Poor engine maintenance is the most common cause of engine faults. Vehicles have specific maintenance cycles, and if the owner does not perform maintenance on schedule, coupled with poor driving habits, it will increase the burden on the engine operation, ultimately prompting the fault light to turn on. 3. Fuel quality issues: The fuel quality here includes both fuel and engine oil. The fuel added to a car usually has a specific grade, and engine oil can be semi-synthetic or fully synthetic. Manufacturers generally recommend which grade of fuel and type of engine oil to use. If the owner does not add them as required, it will cause engine wear over time.