What are the reasons for the yellow engine fault indicator light?
2 Answers
The reasons for the yellow engine fault indicator light are: 1. Poor engine combustion state; 2. Engine knocking; 3. Poor fuel quality; 4. Dirty engine cylinder interior. Car dashboard indicator lights are divided into: 1. A yellow triangle with an exclamation mark in the middle refers to the traction control warning light; 2. A yellow bracket with an exclamation mark in the middle refers to the tire pressure monitoring fault indicator; 3. A yellow bulb with an exclamation mark in the middle refers to the lighting fault indicator; 4. A yellow gear with an exclamation mark in the middle refers to the transmission fault indicator; 5. A yellow fan with an exclamation mark in the middle refers to the windshield wiper fault indicator.
I've been driving for over twenty years and have seen the engine malfunction indicator light (MIL) turn yellow quite often, usually due to sensor or emission system issues. The most common culprit is a faulty oxygen sensor, which monitors exhaust gases. When it fails, it can easily trigger false alarms and may also increase fuel consumption. Worn-out spark plugs and burnt ignition coils are also frequent issues, especially in high-mileage vehicles. Clogged fuel injectors or severe carbon buildup can also cause the light to illuminate. My advice is not to panic when the light comes on—first check simple things like whether the fuel cap is loose. If the light stays on, it's best to use an OBD scanner to read the trouble code and pinpoint the issue, addressing it promptly to prevent minor problems from escalating. Regular replacement of air filters and engine oil can help prevent these issues.
