Ford part XW4Z-3N824-AA is a genuine OEM Power Steering Pressure Switchor Switch Assembly.Mounted directly on or near the power steering high-pressure hose, this sensor monitors the hydraulic pressure of the power steering fluid.When you turn the steering wheel sharply (especially while idling or parking), the power steering pump works harder, placing a sudden load on the engine. This switch senses the pressure spike and signals the Engine Control Module (ECM) to slightly increase the engine's idle speed (RPMs) to keep it from stumbling or stalling
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