What is the difference between a red light and a yellow light on the engine?

[LeJosiah]

An illuminated red light on the engine indicates an emergency state. You should not continue driving and must pull over safely as soon as possible, then contact a repair facility to assess the engine's condition. There are two common scenarios when the engine red light comes on: The first is insufficient oil pressure, signaled by the oil pressure warning light. When this light activates, it means oil pressure is inadequate. The second is the coolant warning light, which illuminates when the coolant level drops below the minimum threshold or due to overheating. Reasons for the engine malfunction light to activate include: Poor fuel quality leading to incomplete combustion in the cylinders and carbon buildup; excessive engine mileage causing weakened spark plug performance; mechanical aging of vehicle components; and issues with water temperature, crankshaft position, air flow, intake temperature, oxygen sensor damage, poor contact, or signal interruption.