The EGR (exhaust gas recirculation) valve meters exhaust back into the intake to reduce emissions; a stuck or failed valve triggers codes, rough idle, and reduced power. We stock OEM-brand EGR valves for common diesel platforms including Ford Powerstroke, Dodge Ram Cummins, and GM Duramax. Many carry no core charge and ship fast within the US. Confirm fitment by OEM part number for your specific engine and year.