What does it mean when the engine malfunction indicator light is on?
2 Answers
The illumination of the engine malfunction indicator light indicates sensor failure, poor combustion state, or carbon deposits inside the engine. It is necessary to check the water temperature gauge and the oil pressure warning light. If the water temperature gauge and oil pressure warning light are not activated, the vehicle can still continue to be driven. However, it is important to control the speed at this time and promptly go to a repair station for inspection. If the water temperature is too high or the oil pressure warning light comes on, and the vehicle is clearly experiencing a malfunction, immediately pull over and request assistance. Poor combustion state: Poor combustion state in the engine is the main reason for the engine malfunction indicator light to come on. In automotive design, to ensure the engine is in good working condition and to maintain its normal working lifespan, an oxygen sensor is installed to monitor the engine's combustion state. Once the engine's combustion state is poor, it not only causes environmental pollution but also leads to fuel waste and excessive engine wear. Poor fuel quality: Since the engine has requirements for fuel quality indicators, especially as various regulations impose higher demands on engines, the requirements for fuel quality indicators have also increased. In practice, some gas stations cannot fully comply with the specifications to provide fuel that meets the needs of high-performance engines, which often results in the engine malfunction indicator light coming on. Carbon deposits inside the engine cylinders: After a certain period of use, the engine interior inevitably accumulates some carbon deposits. These deposits themselves cause changes in the engine's design parameters and, due to their unstable nature and heat retention, can lead to disorderly ignition in the engine, causing engine knocking. In such cases, the engine malfunction indicator light will also come on.
When this light comes on, it means the car's engine system has detected something wrong. Just like our bodies show symptoms when we're unwell, cars have their own way of sounding the alarm. It could be dirty fuel clogging the fuel injectors, or the oxygen sensor in the exhaust system detecting excessive emissions. It might also be time to replace the spark plugs if ignition isn't running smoothly. The most concerning scenario is if it starts flashing—pull over and turn off the engine immediately, as it could indicate severe engine misfiring. I've seen cases where people kept driving with the light on, only to end up with over 30,000 in repairs. Actually, paying attention to fuel grades when refueling and regularly cleaning carbon deposits can prevent most of these issues.
