What are the reasons for the engine yellow light to illuminate on a car?

[JulietMarie]

The reasons for the engine yellow light to illuminate on a car are: 1. Sensor malfunction causing the car's ECU to inaccurately obtain engine data; 2. Carbon buildup in the engine; 3. Faulty spark plugs, ignition coil failure, fuel pump malfunction, or clogged fuel lines leading to incomplete combustion of the air-fuel mixture; 4. Clogged intake valves. Methods to address the engine warning light include: 1. Remove the positive and negative battery terminals, wait for 20 seconds, and then reattach them; 2. Replace spark plugs or the ignition coil; 3. Replace the air filter and clean the throttle body and fuel lines; 4. Change the engine oil; 5. Clean carbon deposits from the engine.