The function of the EGR valve is to control the flow of recirculated exhaust gases depending on the engine load. EGR Cooler Valve For FOCUS For BOXER 2.0HDi 9807593080. Shortens engine warm-up time, quickly reaching optimal operating temperature during cold starts, improving energy efficiency. Make the cold start smoother, the idle speed more stable, and improve the driving experience. It improves overall engine efficiency, resulting in a more stable idle, better fuel efficiency, and reduced oil pollution., Manufacturer: ROUSHI