Check engine question?

Sure you could do that. Bear in mind that each time that is done it will reset the PCM readiness tests as well as the idle/fuel trim values. The effect of this will be:

* Car will drive/idle poorly as the trim values are being re-learned.
* Automatic transmission will shift harsh as shift points are re-learned.
* The car will NEVER pass inspection because the readiness tests are not complete.

In my experience working with EGR problems, the DPFE sensor is the cause about as often as the EGR valve itself. If the vacuum hoses to the DPFE leak, this will cause DTC's. Also, Ford changed the calibration values to reduce false positives. The problem is esp bad with the metal version of the DPFE.

I personally have replaced more good EGR valves only to find out it was really the DPFE sensor all along.

Why? It will just come back after a few drive cycles. Besides, reseting the PCM with a scanner will have almost the same effect as disconnecting the battery. What's the point? If you know what the problem is and don't want to fix it, ignore the light.