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My CEL light came on, EGR Flow Excessive.

I popped the hood so i could check the EGR valve and make sure it was functioning properly, when i noticed that there was vacuum coming from the vacuum line. Problem is i was idling, there should be no vacuum at idle, the EGR valve shouldnt be open. I tested teh valve and its fine. So im thinking its the DPFE sensor. My question is, is there anything else that could be telling the car to send vacuum to the EGR valve? The only thing i can think of is that DPFE sensor. Ive replaced that sensor once already about 10,000 miles ago. So do yall think im right? And also, can anyone link me to the bench test for that sensor?

Forgot to mention, the idle goes up when i unplug the vacuum line, and drops when i reconnect it (Duh).
 

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Good EGR/DPFE system summary here: Ford DPFE EGR System

Good EGR/DPFE troubleshooting guide here: Ford EGR System Diagnostic Tips

Possible causes of P0402 Excessive EGR Flow:

l EGR valve stuck open
l Plugged EGR tube
l Slow responding DPFE sensor
l Damaged DPFE sensor
l Improper vacuum hose connection
l Plugged vacuum hoses
l Plugged EGR vacuum regulator solenoid vent
l EGRvacuum regulator circuit shorted to ground
l Damaged EGR vacuum regulator solenoid
l Damaged PCM
 
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