What does it mean when the car's warning light stays on?

[HectorDella]

The reasons why the car's warning light stays on are: 1. Oxygen sensor malfunction; 2. Poor engine maintenance; 3. Engine misfire; 4. Poor combustion of the air-fuel mixture; 5. Clogged air filter; 6. Faulty mass airflow sensor; 7. Spark plug carbon buildup; 8. Damaged coolant temperature sensor. An engine is a machine that converts other forms of energy into mechanical energy, which can be used either as a power generation device or refer to the entire machine including the power unit. Based on its working principle, engines are classified into: 1. External combustion engine: Fuel burns outside the engine; 2. Internal combustion engine: Fuel burns inside the engine.