Waste gate
A valve used to limit the boost developed in a turbocharger. A waste gate operates by allowing some of the engine's exhaust flow to bypass the turbocharger's turbine section under certain conditions.

Water in fuel warning light
This is a warning light only found on diesel-engined cars. Since diesel fuel collects water, a sensor in the fuel tank will go off when the ratio of diesel fuel to water reaches a certain level.

Work
From a physical point of view, "work" is the product of a force by a movement. Intuitively, we could define work as the energy necessary to cause a body to move.