Why is the car engine warning light constantly on?
2 Answers
There are several reasons why the car engine warning light remains illuminated: 1. Oxygen sensor malfunction; 2. Poor engine maintenance; 3. Use of low-quality fuel; 4. Poor combustion of the air-fuel mixture; 5. Dirty air filter; 6. Faulty mass air flow sensor; 7. Spark plug carbon buildup; 8. Damaged coolant temperature sensor; 9. Engine misfire. An engine is a machine that converts other forms of energy into mechanical energy, which can refer to either the power generation device or the entire machine including the power unit. Based on working principles, engines are classified into: 1. External combustion engines: Fuel burns outside the engine; 2. Internal combustion engines: Fuel burns inside the engine.
I've been driving for many years and have encountered the engine warning light staying on several times. This issue can range from minor to serious. Common causes include: a faulty oxygen sensor, which monitors exhaust gases and triggers the light if emissions exceed standards; a clogged or damaged catalytic converter preventing proper exhaust flow; or misfires caused by worn spark plugs or faulty ignition coils. Minor issues like a loose fuel cap can also trigger the light, but if it stays on, never ignore it. I remember one time when I didn't address the light promptly, the engine started shaking, fuel consumption skyrocketed, and I almost needed a tow. The safest approach is to immediately visit a repair shop to scan for trouble codes with an OBD scanner, which can pinpoint the exact cause and prevent further damage. Regular vehicle inspections help reduce unexpected failures, such as scheduled maintenance to clean sensors.
