What does it mean when a sedan's yellow warning light comes on?

[DelLuna]

A sedan's yellow warning light comes on due to an engine malfunction. Sensor issues: Sensors include those for coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors. When these sensors are damaged, have poor connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data, which triggers the engine warning light. Poor fuel mixture combustion: Engine issues such as faulty spark plugs, defective ignition coils, malfunctioning fuel pumps, or clogged fuel lines can lead to poor combustion of the air-fuel mixture. Poor combustion results in engine carbon buildup or knocking, which is detected by the engine's oxygen sensors and reported to the ECU, prompting the warning light to illuminate as an alert.