Rein OE Quality power steering air vacuum control valves are manufactured to factory specifications using OE grade components. A P/S air control valve serves the important function of controlling the engine idle speed during low speed steering situations. A sign of a failing or failed power steering air control valve may include the loss of P/S fluid through an internal or an external leak around the valve and or engine speed instability during low speed steering. Trust the quality of Rein's 100% tested OE fit, form and function automotive power steering air control valves.