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.
3 â Emission Control. Your Malfunction Indicator Lamp (the engine warning light) may well illuminate to warn you that there is a problem with your emission control system. This can stretch to an exhaust issue, a catalytic converter issue or an engine issue. â Engine Warning Light Malfunction. In some rare cases the engine light will come on, not because there is an issue with the engine, but a malfunction with the light itself. If this happens, you can try resetting the check engine light.