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Catalytic Converter throwing off O2 sensor

Discussion in '4th Gen 4Runners (2003-2009)' started by cmatthews104, Jun 1, 2019.

  1. Jun 1, 2019 at 7:10 PM
    #1
    cmatthews104

    cmatthews104 [OP] New Member

    Joined:
    Apr 25, 2018
    Member:
    #5893
    Messages:
    16
    Gender:
    Male
    First Name:
    Cameron
    Vehicle:
    2005 Sport Edition V8
    None
    Alright so I just bought an 05 4runner with the v8 in and the previous owner had the both catalytic converters taken off. It’s throwing the P0037 code and I’m wondering if there is a simulator that could trick the computer or if I need to replace the O2 sensor. Also, the guy said the transfer case was messed up and wouldn’t allow it to go into lo4, however I can hear the relay working and the actuator working but it won’t engage and causes the center diff lock light to stay on with an annoying beep. If y’all can help in anyway that would be great!
    7095E0E5-EE68-42BB-B4A7-13D9BBA1072F.jpg
     
  2. Jun 2, 2019 at 7:01 AM
    #2
    MI-FL off roader

    MI-FL off roader T4R Hobby/Addict

    Joined:
    Aug 21, 2015
    Member:
    #878
    Messages:
    928
    Gender:
    Male
    First Name:
    Brett
    Merritt Island, FL
    Vehicle:
    03' SR5 Sport - 12' Limited
    Too many mods and too much money
    Underdog Racing Development has Simulators. If you haven't replaced the CATS, a new o2 sensor won't help. Is there a performance exhaust installed?

    I wonder if your 4Lo issues are because the ECU is setting the p0037 code and it is not letting it engage until the error is fixed. The actuators do get wet or lack of use will cause a failure sometimes, but judging by all the mods he did take it off road occasionally, so lack of use might not be the case here. That's all I got. Hopefully someone with more knowledge will chime in.

    https://www.urdusa.com/urd-rear-sensor-simulator-universal/
    Good Luck!
     
    cmatthews104 [OP] likes this.

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