What causes the engine yellow light to illuminate on the vehicle dashboard?

[LenaRose]

The reasons for the engine yellow light illuminating on the vehicle dashboard are: 1. Damage, poor contact, or signal interruption of sensors such as the water temperature sensor, crankshaft position sensor, air flow sensor, intake temperature sensor, and oxygen sensor, causing the ECU to inaccurately obtain engine data; 2. Improper maintenance increasing the operational burden on the engine; 3. Poor fuel quality leading to increased carbon deposits inside the engine cylinders; 4. Faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines causing poor combustion of the engine's air-fuel mixture; 5. Clogged vehicle air filter restricting air intake.