Exhaust Gas Recirculation (EGR) System: Notes
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The EGR system routes exhaust gases back through the engine to reduce emissions. When the exhaust gases exit the exhaust manifolds they enter the intake manifold through the EGR valve by either first passing through the EGR cooler or bypassing the EGR cooler depending on the position of the EGR cooler bypass valve.