What does it mean when the engine warning light is yellow?

[CassidyLee]

When the engine warning light is yellow, it indicates a fault in the engine exhaust system. The reasons for the engine exhaust system warning light to illuminate include: 1. Poor fuel quality; 2. Severe spark plug carbon buildup; 3. Faulty oxygen sensor, engine knocking, or damaged coolant temperature sensor; 4. Engine misfire. If not addressed promptly, it can lead to engine damage and non-compliant exhaust emissions. The car engine is the device that provides power to the vehicle, determining its performance, fuel efficiency, stability, and environmental friendliness. Car engines are categorized into diesel engines, gasoline engines, electric vehicle motors, and hybrid motors. Among these, gasoline and diesel engines are both types of reciprocating piston internal combustion engines, converting the chemical energy of fuel into mechanical energy of piston motion to deliver power.