What Causes the Engine Malfunction Light to Illuminate Yellow?

[DiEliana]

There are two colors for the engine malfunction light: yellow and red. Yellow indicates a warning, while red signifies a prohibition. When the yellow malfunction light is on, it means certain system parameters in the vehicle may have exceeded the set range. The car can still be driven, but some functions may be limited. When the red malfunction light is on, the vehicle must be stopped immediately, the engine turned off, and driving prohibited until the fault is checked. Common reasons for the engine malfunction light to illuminate include: sensor failure, oil quality issues, poor mixture combustion, turbocharging problems, intake issues, exhaust problems, or anti-theft system malfunctions. If the engine malfunction light comes on, follow these steps: First, check if the engine is running normally. Look for issues like shaking, black smoke, or difficulty starting. If any of these are present, avoid restarting the engine. Note: If the red light is on, do not restart the engine under any circumstances. If the engine is running normally and the car can be driven, proceed to a service station as soon as possible to diagnose the issue. A service station can easily read the fault codes using a portable diagnostic tool to identify and fix the problem. If the engine is running normally, the owner can also try gently reconnecting various wiring harness connectors, as a loose connection might be the cause. Alternatively, repeatedly turning the key to the ON position may reset the light.