The vapor pressure of a liquid is the point at which equilibrium pressure is reached, in a closed container, between molecules leaving the liquid and going into the gaseous phase and molecules leaving the gaseous phase and entering the liquid phase.n explanation of vapor pressure. Vapor pressure is constant when there is an equilibrium of water molecules moving between the liquid phase and the gaseous phase, in a closed container.
When a potential problem is detected, a dashboard warning light called a malfunction indicator light (MIL) is illuminated to alert the driver. An OBD system detects a problem well before symptoms such as poor performance, high emissions or poor fuel economy are recognized by the driver.
Signifies the all-wheel drive or 4X4 system is engaged. Can also mean there is a problem with the all-wheel-drive system if the light remains on even when the system is disengaged. ABS light. On some vehicles, it may illuminate if the anti-lock braking system is active. If it remains illuminated, there is most likely a fault with the ABS system.