What does it mean when the engine light comes on?

[Figueiredo]

When the engine light comes on, it indicates that there is a fault in the engine that needs to be checked. The possible causes include: 1. Faulty oxygen sensor; 2. Damaged air flow sensor; 3. Carbon deposits inside the cylinders; 4. Poor-quality gasoline that does not meet standards; 5. Engine misfire. The methods to address the engine light issue are: 1. Clean the engine; 2. Use higher-grade gasoline; 3. Improve fuel quality. The impacts of the engine light coming on include: 1. Deterioration of vehicle exhaust quality and 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.