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Thread: Monterey EGR HELP

  1. #1 Monterey EGR HELP 
    Car Enthusiast CF Newbie
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    I have a '05 monterey and have check engine light on. Auto Zone gave me code p0401. They say it is EGR valve, but do not know anything about it. Can some one help with this code before I go and replace the EGR valve? Is it something that can be cleaned? Is there sensors on it to clean or anything? Please help, thank you.
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  2. #2  
    CF.com mod CF Senior Member
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  3. #3  
    Car Enthusiast CF Newbie
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    Can anyone build on this? Still kind of vague.
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  4. #4  
    NKAWTG CF Admin Alchemist's Avatar
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    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


    try cleaning it before replacing anything.
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  5. #5  
    Car Enthusiast CF Newbie
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    Anyone have any pics or diagram of the EGR valve and vacuum, etc? thanks.
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