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On the 2009 Hyundai Santa Fe, you can locate the EGR valve downstream of the throttle body near the exhaust manifold. The estimated cost for replacing this part with a Duralast EGR Valve, part number EGR4198 from Autozone, is approximately $37. To replace it, you simply need to unscrew the two bolts, disconnect the wire clips that link the valve to the engine harness, swap out the old valve with the new one, and then reattach the wires and bolts. Signs that your EGR valve may be failing include rough idling, increased fuel consumption, frequent stalling at idle, engine knocking noises, and the check engine light coming on with a diagnostic trouble code associated with the valve.
In the 2009 Hyundai Santa Fe, you can find the EGR valve positioned between the exhaust and intake manifolds.