stockrodder,
On the back of the EGR valve there is an EVP sensor. It monitors the position of the EGR valve and sends a signal to the ECU of it's position.
The EVP sensor it not serviceable, if bad it must be replaced.
If you're certain the EGR valve is working but you're still getting EGR codes, the EVP sensor is probably bad. You can get a new one at the Ford part's counter; don't believe it can be checked but not sure.
If you've ever washed your engine bay with high pressure water at the quarter car wash and didn't cover the EGR, the EVP sensor is most likely bad.
Phil
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