What does it mean when the ignition warning light on the car dashboard is on?

[MaverickLynn]

Ignition warning light on indicates a fault with the ignition system, spark plugs, or ignition coils, requiring prompt inspection and repair. Below is an introduction to spark plugs: 1. Working principle: Under high voltage, the air between the center electrode and side electrode of the spark plug rapidly ionizes, forming positively charged ions and negatively charged free electrons. When the voltage between the electrodes reaches a certain level, the number of ions and electrons in the gas increases like an avalanche, causing the air to lose its insulating properties and forming a discharge channel, resulting in a "breakdown" phenomenon. At this point, the gas forms a luminous body, known as a "spark." Along with the heat expansion, a "crackling" sound is also produced. 2. Characteristics: The standard for spark plugs typically uses heat value to characterize their thermal properties. The heat value of a spark plug indicates the balance between heat absorption and dissipation at the insulator skirt. The higher the heat value, the stronger the balance between heat absorption and dissipation. Therefore, hot-type spark plugs have a low heat value, while cold-type spark plugs have a high heat value.