What does it mean when the yellow engine light on the car dashboard comes on?

[CooperLee]

There are two situations when the yellow engine light on the car dashboard comes on: 1. When the owner turns on the car's power, the vehicle will perform a self-check. At this time, not only the yellow engine light will come on, but other warning lights will also light up together and then turn off together. This is a normal phenomenon; 2. After the car is started, if the yellow engine warning light remains on, it means the ECU is alerting that there is a fault in the engine, which is an abnormal phenomenon. Reasons for the yellow engine light coming on: 1. Sensor issues: Sensors include those for coolant temperature, crankshaft position, air flow, intake air temperature, oxygen, etc. When these sensors are damaged, have poor contact, or signal interruption, the ECU cannot accurately obtain engine data, which will cause the engine warning light to come on; 2. Maintenance issues: Poor engine maintenance is a common cause of the engine warning light coming on.