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(P0125, P1130, P1135) FIXED!!

Discussion in '1st Gen. Tacomas (1995-2004)' started by TacoJohn22, Sep 6, 2016.

  1. Sep 6, 2016 at 11:56 AM
    #1
    TacoJohn22

    TacoJohn22 [OP] New Member

    Joined:
    Sep 6, 2016
    Member:
    #196568
    Messages:
    1
    Gender:
    Male
    First Name:
    John
    Vehicle:
    2000 Tacoma Regular cab, manual, 2 wheel drive, 2.4L
    A few days ago my check engine light lit up. I scanned it and it threw 3 codes, P0125= Closed Loop Fuel Control Insufficient Coolant temp; P1130= O2 Sensor Circuit malfunction (Bank 1 Sensor 1); and P1135= O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1).

    So I purchased an up-stream(pre cat) sensor (part#234-9001) from Amazon for around $80. I also purchased a gas cap form O'rileys autoparts which was $10 because someone mentioned it may be as simple as that. I installed them both, cleared the codes..... and now it runs great!!

    Moral of the story if you have codes (P0125+P1130+P1135)= Up-stream O2 Sensor and Gas
    cap.

    IMG_8913.jpg
    IMG_8914.jpg
     
    jammer likes this.
  2. Sep 6, 2016 at 5:05 PM
    #2
    ghs57

    ghs57 Well-Known Member

    Joined:
    Jul 27, 2010
    Member:
    #40832
    Messages:
    1,091
    Gender:
    Male
    First Name:
    Chops
    Catskill Mts. NY
    Vehicle:
    '07 Black TRD OR xtracab 4.0L 4WD
    Pretty much stock right now
    I'm dealing with the upstream O2 (Air/Fuel) sensor code right now also. Waiting on the part. Throwing the P0135 code.
     
    Last edited: Sep 7, 2016
  3. Sep 7, 2016 at 7:41 PM
    #3
    Zer0

    Zer0 Well-Known Member

    Joined:
    Dec 15, 2013
    Member:
    #118626
    Messages:
    358
    Gender:
    Male
    SGV, California
    Vehicle:
    99 PreRunner
    Cool thanks!!
     
  4. Oct 25, 2020 at 6:25 PM
    #4
    thehadmatter

    thehadmatter Member

    Joined:
    Jan 1, 2016
    Member:
    #173680
    Messages:
    21
    Gender:
    Male
    Charlottesville, VA
    Vehicle:
    2001 EXT CAB SR5 2RZ-FE 5spd 2WD
    My 01 with a 2RZ-FE has P0125+P1153+P0171. Would you recommend the A/F sensor (pre-cat) as well before smoke testing? P0171 is system too lean bank 1.
     
  5. Oct 25, 2020 at 7:50 PM
    #5
    Black DOG Lila

    Black DOG Lila Well-Known Member

    Joined:
    Jun 14, 2019
    Member:
    #296344
    Messages:
    6,877
    Virginia
    Vehicle:
    2003 Tacoma SR5 2.7 5 speed 4WD
    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
    01 California had A/F sensor B1S1
    Federal emissions 01 had O2 sensor
    Check the emissions sticker under hood for Cali or Fed then look up sensor and purchase identical Denso replacement from link below.
    https://densoautoparts.com/find-my-part.aspx
     
    thehadmatter likes this.
  6. Nov 7, 2020 at 6:35 AM
    #6
    thehadmatter

    thehadmatter Member

    Joined:
    Jan 1, 2016
    Member:
    #173680
    Messages:
    21
    Gender:
    Male
    Charlottesville, VA
    Vehicle:
    2001 EXT CAB SR5 2RZ-FE 5spd 2WD
    Can confirm! I just replaced the A/F sensor a week ago after I got the P0125 + P1135 + P0171 and the check engine light did not return after a lengthy test drive. One of the key signs is that it's a heating circuit issue with the A/F sensor; no heat, no workee. It was Denso part 234-9001 but it didn't come with any fasteners and mine were a corroded mess. I recommend buying a few M8 x 1.25 COPPER flange locking nuts before you start just in case you need to torch and or grind your nuts off like I did mine; mind the studs. old sensor.jpg
     

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