What Are the Reasons for the Engine Exhaust System Warning Light to Illuminate?
2 Answers
The reasons for the engine exhaust system warning light to illuminate are: 1. Malfunction of the fuel pump or ignition system; 2. Failure in the engine exhaust system; 3. Damaged oxygen sensor or poisoned three-way catalytic converter; 4. Excessive carbon buildup in the throttle or engine internals. The function of the engine is: to convert the thermal energy of gasoline or diesel into mechanical energy by expanding gases after combustion in a sealed cylinder, thereby driving the piston to perform work. The maintenance methods for the engine include: 1. Regularly changing the oil and oil filter; 2. Using lubricants of appropriate quality grades; 3. Periodically cleaning the radiator; 4. Regularly servicing the air filter, oil filter, and fuel filter; 5. Maintaining good ventilation in the crankcase and cleaning it periodically; 6. Regularly cleaning the fuel system.
I just encountered this issue last week when the exhaust light suddenly came on, which gave me quite a scare. The most common cause is a faulty oxygen sensor, which monitors exhaust pollution—if the data is inaccurate, it triggers the light. It could also be due to a clogged catalytic converter, often caused by using low-quality fuel. Additionally, a loose fuel cap can trigger a false alarm; I once found mine wasn’t tightened properly during a self-check, and the light went off after I secured it. However, never ignore it—delayed action could damage the engine, increase fuel consumption, or impact emissions. I recommend checking the fuel cap and observing exhaust smoke first when the light comes on. If anything seems off, head to a repair shop to read the trouble codes promptly.
