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Combination of Error Codes

Discussion in '1st Gen. Tacomas (1995-2004)' started by brogers, Jul 9, 2010.

  1. Jul 9, 2010 at 12:32 PM
    #1
    brogers

    brogers [OP] New Member

    Joined:
    Jul 9, 2010
    Member:
    #39974
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    Male
    Atlanta
    Vehicle:
    01 4WD Tacoma 4cyl
    Any ideas about what may be going on here? Thanks for any help! (I also posted this in the Technical section, apologies for posting in multiple forums - not sure which is best for this question).

    2001 Toyota Tacoma 4WD, 4cyl 2.7L, 110 K miles

    The check engine light came on -- codes were P0125 and P1135. I reset the light by disconnecting the battery cable and drove a couple of miles. When the light came back on, a new code appeared P0171, the other codes did not come back up.

    The following was done:
    1. Removed and replaced spark plugs
    2. Cleaned the MAF sensor
    3. Replaced the air filter
    4. Reset the light

    Then I drove the truck, the light came back on, one code: P0125

    1. Replaced the thermostat (actually looked fine)
    2. Replaced the ECT sensor (could that have been in a tougher place to get to?)
    3. Refilled the coolant
    4. Reset the light

    Then drove the truck -- the light came back on, this time only P0171.

    1. Checked for coolant leaks
    2. Found that I had knocked the vacuum line off from the air intake, reconnected it.
    3. Reset the light

    Drove the truck, light came back on. This time all three codes came up: P0125, P1135, P0171.

    Any suggestions for the next step?
     
  2. Jul 10, 2010 at 8:18 AM
    #2
    03redtaco

    03redtaco Well-Known Member

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    May 10, 2010
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    First Name:
    Richard
    Myrtle Beach SC/ Starke FL
    Vehicle:
    03 Tacoma Prerunner SR5 DC 3.4L
  3. Jul 10, 2010 at 8:21 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
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    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    I would replace the air/fuel and O2 sensors.
     
  4. Jul 10, 2010 at 1:56 PM
    #4
    biggdog747

    biggdog747 Well-Known Member

    Joined:
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    #32729
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    Male
    MI
    Vehicle:
    taco
    X2
     
  5. Jul 31, 2010 at 11:00 AM
    #5
    Andruck

    Andruck New Member

    Joined:
    Jul 31, 2010
    Member:
    #41020
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    1
    Gender:
    Male
    North Carolina
    Vehicle:
    2001 Tacoma
    Fixed w/replacement of A/F Oxygen Sensor. The A/F Sensor is Bosch 13613 for a 2001 Tacoma 2.4L 5-speed. BTW, just bought the truck w/137,000 miles so I checked the sparkplugs and they looked original, found the same NGK brand and installed.
     
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