What are the common reasons for the engine warning light to illuminate?

[DelMason]

Engine warning light illuminates due to the following reasons: 1. Poor combustion state. Poor combustion state is the main reason for the engine warning light to illuminate. 2. Engine knocking. The car lacks power, the engine noise is too loud, and there is an obvious knocking sound. 3. Poor fuel quality. 4. The engine cylinders are not clean and have carbon deposits. Below are additional details about the engine: 1. Poor engine maintenance is the most common cause of the engine warning light illuminating. 2. Sensor issues. When the sensor is damaged, has poor contact, or the signal is interrupted, the car's ECU cannot accurately obtain engine data, causing the engine warning light to illuminate. 3. The fuel added to the car has a specific grade, and the engine oil is divided into semi-synthetic and fully synthetic. If the owner adds inappropriate fuel or engine oil, it will cause engine wear over time.