What are the reasons for the engine warning light to come on?

[StConnor]

There are usually the following reasons for the engine warning light to come on: 1. Poor combustion state: Poor combustion state of the engine is the main reason for the engine warning light to come on. During driving or at the moment of ignition, the engine warning light on the dashboard (usually red or yellow) will illuminate. In most cases, it will not disappear automatically, while in a few cases, it may disappear on its own. This is what is referred to as the engine warning light coming on. 2. Engine knocking: In the first scenario, some engine warning lights may come on, while others may not. In the second and third scenarios, the engine warning light will inevitably come on. 3. Internal reasons for the engine warning light coming on: Poor fuel quality; unclean engine cylinders with accumulated carbon deposits. Over time, the engine will inevitably accumulate some carbon deposits. These deposits can alter the engine's design parameters and, due to their unstable nature and heat retention, can cause disordered ignition, leading to engine knocking.