Engine warning light illumination is typically caused by the following reasons: Poor combustion condition: Suboptimal engine combustion is the primary cause of the engine warning light activation. During vehicle operation or at the moment of ignition, the engine fault indicator on the dashboard (usually red or yellow) illuminates. In most cases, it won't disappear automatically, though it might in rare instances - this is what's referred to as engine warning light activation. Engine knocking: In the first scenario, some engine warning lights may illuminate while others won't; in the second and third scenarios, the light will inevitably activate. Underlying causes for engine warning light illumination include: Poor fuel quality; Dirty engine cylinders with carbon deposits. Over time, engines inevitably accumulate carbon deposits which alter design parameters and, due to their unstable nature and heat retention properties, can cause irregular ignition leading to engine knocking. Cooling system malfunctions such as piston scuffing, knocking, internal cylinder leakage, severe noise generation, and reduced acceleration power: These occur due to abnormal engine operating temperatures, excessive pressure, and poor cooling system conditions. A malfunctioning cooling system directly prevents the engine from operating at normal temperatures, subsequently causing the aforementioned severe fault symptoms.
