What does the yellow light on the car indicate for a fault?

[Catalina]

This yellow light is the engine malfunction indicator light. When the engine malfunction indicator light turns yellow, it indicates a fault in the engine. The following are the reasons why the engine malfunction indicator light may illuminate: Excessive carbon deposits: The gasoline used may be of poor quality or there may be excessive carbon deposits in the engine, leading to poor combustion conditions, which could trigger the malfunction indicator light. In such cases, it is generally necessary to promptly inspect the engine and seek maintenance at the nearest vehicle repair shop. Faulty oxygen sensor in the engine: This type of fault usually causes the engine malfunction indicator light to turn yellow but does not affect normal driving. However, it is important to remember to check the cause of the illuminated engine malfunction indicator light after driving.