What does it mean when the engine indicator light turns yellow?

[JulianaLee]

When the engine malfunction indicator light turns yellow, it indicates that there is a problem with the engine. Excessive carbon buildup: If the gasoline used is of poor quality or there is excessive carbon buildup in the engine, it can lead to poor combustion, which may trigger the malfunction indicator light. In such cases, it is important to promptly inspect the engine and seek maintenance at a nearby vehicle repair shop. Oxygen sensor malfunction: If the engine's oxygen sensor malfunctions, it typically causes the engine malfunction indicator light to turn yellow. While this does not affect normal driving, it is advisable to have the engine checked to determine the cause of the light after driving. Intake valve blockage: Issues such as clogged fuel injectors or carbon buildup in the intake valve can trigger the malfunction indicator light. These problems are often related to the quality of the fuel used or dust entering the engine during maintenance.