What does it mean when the warning light is on?

[DeJuniper]

There are several reasons why the engine warning light in a car may illuminate, including sensor failure, spark plug failure, ignition coil failure, fuel pump failure, or fuel line blockage. Below are details about the causes of an illuminated engine warning light: 1. Engine warning light on: Possible causes include poor fuel quality, incomplete combustion, or excessive accumulation of contaminants in the engine. 2. Coolant temperature warning light on: This light typically indicates either that the engine coolant temperature is too high or that there is insufficient coolant. If the engine temperature is too high, do not immediately turn off the engine. Instead, the driver should slow down, stop the vehicle, and then attempt to cool it down. If the coolant level is low, wait for the radiator to cool down before adding more coolant.