What does it mean when the engine fault light appears on the dashboard?

[McWyatt]

The reasons for the engine fault light appearing on the dashboard are: 1. Poor gasoline quality leading to incomplete combustion of the air-fuel mixture in the cylinders, resulting in carbon deposits; 2. Excessive engine mileage causing weakened spark plug performance; 3. Vehicle mechanical aging; 4. Damaged, poorly connected, or interrupted signals from sensors such as coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors. Hazards of engine faults: 1. Deterioration in vehicle exhaust quality, causing environmental pollution; 2. Increased combustion chamber temperature and accelerated wear, leading to premature engine damage; 3. Engine oil consumption; 4. Increased engine noise, affecting driving and passenger comfort.