EGR flow trouble codes can be tricky if you do not know your systems. This video will show you method of quickly testing one of the most commonly faulty parts on a Ford EGR system. The DPFE sensor (delta or differential pressure feedback sensor for the EGR valve).
The only tools you need to test this sensor is a voltmeter and some knowledge of the system. I am using scan data instead of a voltmeter in this case. If you have just a basic OBDII scan tool, most likely you will not be given the option of seeing DPFE sensor signal voltage. In which case, you will have to connect a voltmeter. I will post some other videos within this video (don't turn off your captions) on how to test this DPFE sensor using a voltmeter.

1998 Ford Ranger    • Ford Ranger EGR Flow Trouble Code P04...  
2000 Ford Focus    • 2000 Ford Focus EGR System Tests (EGR...  
1994 Lincoln 4.6    • How to test for proper EGR flow (rest...  
Ford EGR flow test    • Ford EGR Flow Testing (P0401, P0402, ...  

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better online training of how to troubleshoot automotive electrical and electronics systems anywhere!

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Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.