Why does the ignition warning light turn red and the car won't start?

[EdenRose]

The reasons why the ignition warning light turns red and the car won't start are as follows: 1. Phenomenon: During car driving or at the moment of ignition, the engine warning light on the dashboard lights up, usually in red or yellow. Once lit, in most cases it won't disappear automatically, and only in rare cases will it go away on its own. This is what's known as the engine warning light illumination. 2. Reasons for engine warning light illumination: Poor engine combustion state is the main cause of the engine warning light coming on. In automotive design, to ensure the engine operates in good condition and maintains normal working lifespan, oxygen sensors are installed to monitor the engine's combustion state. Once poor combustion occurs, it not only pollutes the environment but also leads to fuel waste and excessive engine wear.