What does it mean when the CHECK light on the car is on?

[LaLillian]

The CHECK indicator light is the engine malfunction indicator. When it illuminates, it indicates that there is an issue with the engine's electronic control system. According to the driver's manual, you should promptly take the vehicle to a 4S shop for inspection. If not repaired in time, it may affect the normal operation of the engine. When the battery is disconnected, the engine control system is reset, so the malfunction indicator may temporarily turn off but will illuminate again after driving for a while, indicating that there is indeed a problem with the engine. It is recommended to have it inspected and repaired at a 4S shop. Below are some related details: 1. Principle: While the vehicle is in motion, if a sensor or switch in the engine system fails, the computer will use preset values to allow the engine to continue running. At the same time, the "CHECK" or "CHECK ENGINE" light on the dashboard will illuminate to remind the driver to take the vehicle to a maintenance shop for repair. 2. Function: The illuminated indicator light alerts the owner that there is a fault in the engine system. It is recommended to use an automotive computer diagnostic tool to check the engine system, read the fault codes and dynamic parameters, and then repair the vehicle based on the detected issues. The light indicates an engine fault, which could be due to an actual problem or a false alarm caused by incorrect operation. Try disconnecting the negative terminal of the battery for five minutes. Note that not all vehicles can clear fault codes by disconnecting the battery. If the fault persists, it means there is an actual issue with the engine.