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Recurring P0401

Discussion in '1st Gen. Tacomas (1995-2004)' started by oakislandrick, Jul 28, 2013.

  1. Jul 28, 2013 at 2:34 PM
    #1
    oakislandrick

    oakislandrick [OP] New Member

    Joined:
    Jul 28, 2013
    Member:
    #109244
    Messages:
    2
    Gender:
    Male
    First Name:
    RJ
    Oregon & NC
    Vehicle:
    Tacoma 2.42WD
    Replaced EGR;
    cleaned all lines (EGR to VSV, EGR to VR, lines to air intake manifold;
    ohms tested satisfactory heat sensor at EGR/intake manifold.
    Lightly (with qTip) cleaned out intake manifold orifice connecting to EGR.

    Next? Replace Vacuum Regulator VG? Replace Vacuum Switching Valve VSV?

    Suggested to "scour" w/22 rifle brass cleaning brush intake mainfold orifice?

    Tacoma has 220k miles and previous owner was spot on with maintenance!
     
  2. Jul 28, 2013 at 2:38 PM
    #2
    tan4x4

    tan4x4 Well-Known Member

    Joined:
    Nov 30, 2011
    Member:
    #67982
    Messages:
    1,972
    Gender:
    Male
    First Name:
    Rick
    Folsom, CA
    Vehicle:
    99 Tacoma EC 4x4 2.7L Auto
    Bilsteins, OME 881's, 3-leaf AAL, Detroit TruTrac, 31" tires, Michelin LTX AT2, stock gears, Tranny skidplate, TC skidplate, CBI rear bumper, sliders, UltraGauge, PowerTank, CB
    For me, I had to remove and clean the EGR temp sensor. Then the 401 would go away for about 6 months and then finally come back. Clean again, etc.
     
  3. Jul 29, 2013 at 7:56 AM
    #3
    oakislandrick

    oakislandrick [OP] New Member

    Joined:
    Jul 28, 2013
    Member:
    #109244
    Messages:
    2
    Gender:
    Male
    First Name:
    RJ
    Oregon & NC
    Vehicle:
    Tacoma 2.42WD
    Forgot to mention that I also thoroughly cleaned EGR gas temp sensor b4 ohm testing cold (200k ohms) and after engine warm p to 120F (87k ohms).
     
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