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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:
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    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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    Myrtle Beach SC/ Starke FL
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  3. Jul 10, 2010 at 8:21 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
    Tenoe, AZ
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    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

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  5. Jul 31, 2010 at 11:00 AM
    #5
    Andruck

    Andruck New Member

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  6. Oct 25, 2020 at 7:11 PM
    #6
    thehadmatter

    thehadmatter Member

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    Charlottesville, VA
    Vehicle:
    2001 EXT CAB SR5 2RZ-FE 5spd 2WD
    I just had this same issue occur and all my diagnostics point to the A/F sensor but part of me wants to smoke test the intake. Should I smoke test or just replace the sensor?
     
  7. Oct 25, 2020 at 7:14 PM
    #7
    High Noon

    High Noon Less Blown Member

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    Welcome to necropolis :bored:
     
    Black DOG Lila likes this.
  8. Nov 21, 2020 at 6:36 AM
    #8
    thehadmatter

    thehadmatter Member

    Joined:
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    Charlottesville, VA
    Vehicle:
    2001 EXT CAB SR5 2RZ-FE 5spd 2WD
    I smoke tested the intake and found a small leak at the aftermarket PCV hose to my cheap Chinese oil catch can. If you spend over $30 (shipping included) on a catch can then you're wasting your money. I tightened up that hose, cleared codes, and test drove. The lean code went away but the coolant temp and A/F codes came back. Replaced A/F sensor Denso part number 234-4189, Toyota part number 89465-09330, cleared codes, test drove and the cel remained off. Truck ran better too. Be prepared for seized/corroded fasteners holding the A/F sensor in place and have M8x1.25 COPPER flange nuts to replace the fasteners that are in place. You may have to grind or torch them off. Good luck and happy torching!
     
  9. Nov 21, 2020 at 5:09 PM
    #9
    Thomas670

    Thomas670 Well-Known Member

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    P1135 is the air and fuel sensor. get denso brand i learned my lesson buy cheap brand ones
     

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