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1997 Toyota Corolla Question: I have a code P0401,cleaned passage system, (no luck), replaced egr,(no luck)



, Pico Rivera, CA, July 17, 2011, 02:46

I'm in the process of finding a book with drawings that tells me more about my problem. I need help!!!

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  • Answer #1

    July 17, 2011, 22:57

    for p0401
    Possible Solutions:
    In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
    Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
    Clean out the EGR valve and/or tubing to remove deposits
    Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
    Replace the DPFE sensor (with a good quality / OEM one)
    Replace the EGR valve

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