The engine error light is often called the Check Engine light, which is one of the warning signals that worries many drivers. On some car models, this warning may appear as a yellow or orange engine icon, or a warning line indicating that the engine needs to be checked or maintained.
No matter what form it is displayed, the general meaning of this indicator light is that the car's electronic control system has detected an incident that needs to be checked. The cause may be related to the exhaust system, engine, gearbox or other electronic components.
In many cases, the Check Engine light is continuously on but the car still operates normally. This often shows that the problem is not serious, but car owners should still take the car for early inspection.
Conversely, if the lights blink continuously, it may be a sign of a serious fault that needs to be handled immediately to avoid causing major damage to the engine.
To determine the cause of the engine warning light turning on, cars manufactured from 1996 onwards are equipped with the OBD2 (On-Board Diagnostics II) diagnostic system. When abnormalities are detected, the system will save the error code in the car's electronic controller.
These error codes can be read using specialized diagnostic devices. Depending on the type of device, users can only view the basic error code or track vehicle activity data in real time.
Currently, many simple fault reading devices are relatively cheap and easy to use, while specialized diagnostic machines are often used by repair garages.
For older models manufactured before 1996, the OBD1 diagnostic system has a more limited ability to identify errors and the reading of error codes is also significantly more complex.
Car owners should not ignore the Check Engine light even if the vehicle is still operating normally. A small error in the early stages can be fixed at a low cost, but if prolonged, it can lead to more serious damage.
For example, the phenomenon of abandoning the engine or starting the ignition at the wrong time can prevent the fuel from being completely burned. If not treated in time, excess fuel can damage the exhaust fume catalyst, which is a part with very high replacement costs.
In some cases, the cause is quite simple. The fuel tank cap is not tightly closed after refueling, which can cause the gasoline vapor control system to detect leaks and activate the Check Engine light. Therefore, when the warning light appears immediately after refueling, drivers should check and tighten the fuel tank cap before taking the car for diagnosis.
