What is the reason why the car maintenance warning light is on?

The engine maintenance warning light comes on for the following reasons: 1. After the engine maintenance warning light is on, the car cannot be started. This may be because the fuel pump can't pump oil or the ignition system is faulty, so it certainly can't start. Call the road rescue directly and tow the trailer away. If the fault light is on, but it does not affect driving, it may be just a sensor fault or a false fault. In this case, you can consider driving to a nearby maintenance point for maintenance. 2. When the engine maintenance warning light is on, the vehicle can run, but the body appears serious vibration, slow driving, weak acceleration and other symptoms. At this time, please do not continue driving. Continuing driving may cause serious damage to the engine and may lead to other unnecessary failures. It is suggested to stop on the right immediately, call for help and wait for road support. 3. The yellow symbol light indicates that the engine has a fault, but the fault does not affect the normal operation of the engine and must be repaired, while the red symbol light indicates that the engine has a serious fault and needs to be repaired immediately under normal circumstances. If it can be used in emergency under special road conditions, it is necessary to always pay attention to the working state of the engine and remind the EFI engine that it has a self-protection control system. There are many situations in which the engine fault light comes on. Some models will report the fault light even if the light is white, but it is not necessarily that the fault light is on.