Home | Mailing List | Specifications | Care and Feeding | Modifications | Vendors | Literature

 

Bad DPFE

12/13/2008


I am getting an insufficient EGR flow code. Eric just cleaned the intake, I had hoped that that would do it.

Vacuum line is intact, any other ideas?

Thanks
Tim
__________________________________________________________________________________________

Bad EGR Valve?
Ryan D
__________________________________________________________________________________________

I just had that on mine, Eric replaced the EGR valve and that stopped the codes.

Don Mallinson
__________________________________________________________________________________________

http://www.obd-codes.com/p0401

Jon Heese
__________________________________________________________________________________________

I'd consider a bad DPFE. Just changed one out a month ago on the original #934 that I now have and reported as not being a cam failure. Have replaced three of these in about the last 1 1/2 years. There was an unannounced recall for frequent failures of these where Ford would replace these for free if the car was brought in within a time frame now long past.
 Lucien
_________________________________________________________________________________________

Differential Pressure Feedback EGR. It's a very common failure on the SLOs, but I don't know how common on a V8 SHO.

Daniel J. Holtman
__________________________________________________________________________________________

Same item down to part number so not immune.
Lucien

I've got one giving me a P0401 code too. I can drive it on the highway and it doesn't throw the code too often, but 20 minutes in town driving and it'll throw it. I checked the EGR by applying a vacuum to it with the engine at idle, and it does right away. According to the troubleshooting, this seems to say the valve is okay. I haven't checked the voltages at the DPFE yet, but figure it's bad.
Andy Clark
_________________________________________________________________________________________

What happens with the Ford DPFEs is water gets into them from condensation of the exhaust and corrodes or freezes and tears things up inside. Almost always the problem. But make sure the two short hoses are seated OK.
Paul
_________________________________________________________________________________________

But for the record here is the list of possible causes.
 

But for the record here is the list of possible causes.



 

HE70 DTC P0401: RUN KOER SELF-TEST

    Diagnostic Trouble Code (DTC) P0401 indicates that Continuous Memory Self-Test has detected insufficient EGR flow.

    Possible causes:

    • Fault in vacuum supply to EGR vacuum regulator solenoid.
    • EGR valve stuck closed or iced.
    • EGR valve diaphragm leaks.
    • EGR valve or flow path restricted.
    • EGR vacuum hose off, plugged or leaks.
    • VPWR circuit open to EGR Vacuum Regulator solenoid.
    • EVR circuit to PCM open.
    • EVR circuit to PCM shorted to PWR.
    • Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both connected improperly.
    • D.P.F. EGR sensor pressure hoses reversed.
    • D.P.F. EGR sensor VREF circuit open.
    • Downstream pressure hose off.
    • Downstream pressure hose plugged.
    • Damaged orifice tube assembly.
    • Damaged EGR Vacuum Regulator solenoid.
    • Damaged D.P.F. EGR sensor.
    • Damaged PCM.

Paul
_________________________________________________________________________________________




HE70 DTC P0401: RUN KOER SELF-TEST
Diagnostic Trouble Code (DTC) P0401 indicates that Continuous Memory Self-Test has detected insufficient EGR flow.

 


Contact Information

ęCopyright  2000 - 2008; all rights reserved by V8SHO