Code P0402: EGR excessive flow

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by vagrantviking, Dec 20, 2010.

  1. vagrantviking

    vagrantviking New Member

    Joined:
    Nov 16, 2010
    Messages:
    6
    Car:
    Mk IV Jetta
    One day I will go for more than a week without the CEL coming on. :confused:

    This time around I get the above code saying EGR excessive flow. Seems a bit odd as I would expect problems with the EGR valve to cause it not to open at all. Pulling off the hose and applying a vacuum it looks like the valve is working fine.

    Next thing working back would be the N18 valve. I am tempted to just order one up and try it but would rather save the $75 if there is a way to test it first. Maybe swap with the N75?

    Looking up general EGR problems I have seen it suggested that the problem is likely the PDFE sensor but I have not found any reference to it on this site. Would like to track it down and test it also before ordering any parts.

    Anything else that I should be looking at?

    Thanks for any insights.
    Viking
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  2. chittychittybangbang

    chittychittybangbang Administrator

    Joined:
    May 23, 2007
    Messages:
    21,776
    Car:
    2006 Jetta TDI
    Location:
    CT
    Yes, start with the n75-n18 swap and see what happens. Maybe wiring? You said you pulled off the hose and it holds vac, next check the the vac lines themselves.

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