What does it mean when the engine's yellow light comes on?

[StEverly]

The reasons for the engine's yellow light coming on are: 1. Poor contact of sensors such as water temperature, crankshaft position, air flow, intake temperature, and oxygen sensors; 2. Poor engine maintenance; 3. Faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines in the engine. The engine is the device that provides power to the car, converting the thermal energy of gasoline and diesel into mechanical energy by burning and expanding gas in a sealed cylinder to push the piston and perform work. Its components include: 1. Valve train; 2. Crankshaft and connecting rod mechanism; 3. Ignition system; 4. Cooling system; 5. Lubrication system; 6. Starting system; 7. Fuel supply system.