The EGR regulater is also called by other names 'vacuum solenoid' but 'pressure regulator' is what Ford calls it. It is NOT the EGR pump proper, (the UFO shaped disk with a 5'8" tube coming into the bottom and a 1/8" vacuum line into the top. The EGR P.R. is a 'plate' about 5x2" ith 2 vacuum tubes (1/4" coming out of the bottom into the Vacuum Tube(aforementioned 5/8" that runs from the exhaust manifold to the EGR pump. The PR also has an electrical plug in to it the powers the vacumm action.
It is in the Haynes under section 6 (no picture) but tells you how to check it. If your code indicated that was bad, go ahead and change it yourself (a $76 Ford-only part and about 5 minutes install), reset your computer (un plug Neg - post for about 15 minutes, then reconnect and go). If your lite comes back on then it is your pump (the 'UFO'), considering those are the only 2 pieces in the EGR process.
BTW, what year, miles, and what was the characteristics of the CEL (Check Engine Lite).
You said it comes on 5-20 min after start (thats when the EGR senses 'warm' and should start its action). But does it stay on, or is this the way it act after cold start ? and was there a noticeable difference in mpg and/or driveability?
Thnx, and good luck
