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O2 sensor, front or rear?

Discussion in '1st Gen. Tacomas (1995-2004)' started by JerzYota, Feb 29, 2016.

  1. Feb 29, 2016 at 11:17 AM
    #1
    JerzYota

    JerzYota [OP] Member

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    I had the dude at the parts store run a test for my check engine light but could only tell me it was "probably an O2 sensor"

    Is it worth going to the dealer or mechanic to get the right code that lets you know which sensor is out?

    Are the diagnostic readers they sell at parts stores any good and are they worth the investment?

    With help from this site I already know I can do the job myself (thanks!) but need to know which one, or both.
     
  2. Feb 29, 2016 at 11:24 AM
    #2
    gearcruncher

    gearcruncher Well-Known Member

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    Great white North 51.0333° N, 93.8333° W
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    2010.TRD.SportDCLB4x4Limited leather package
    TRD Sport Rally -5 speed automatic Limited ,Factory heated leather seats ,chrome package,Super white with front windows tinted to 35 % Dick Cepek DC-2 wheels Summer tires - Good year silent armor P265/65R17 Winter tires - Good year P265/65R17 Ultra Ice studded Illuminated 4x4 switch TRD 3rd brake light cover ($20) TRD seat belt shoulder protectors (5). ($50) TRD ...B pillar emblems ($20) TRD rear slider sticker with devil horns ( $6) TRD summer floor matts ($60) TRD steering wheel emblem ($20) TRD floor pedals .($95) TRD shorty antenna ($14) TRD front Windshield emblems ($17) TRD head pillows .($60) TRD head rest protectors TRD door scuff protection $20 TRD floor matt emblems ($40) TRD tow plug emblem . ($40) TRD cigarette lighter with LED.($35) TRD tissue dispenser ($12) TRD front bezel emblems ($9) TRD door emblems ($6) TRD lanyards($9) TRD lisence plates with TRD bolts($50) TRD fender emblems TRD center caps Part Number:PT904-35070-CC ($80) TRD cd
  3. Feb 29, 2016 at 11:26 AM
    #3
    DustStorm4x4

    DustStorm4x4 BBC 2020

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  4. Feb 29, 2016 at 11:29 AM
    #4
    Speedytech7

    Speedytech7 Toyota Cult Ombudsman

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    I've done a mod or two
    They sure do, my Ultragauge went off on me when I was carrying a bed full of dirt one time. I was climbing up a huge hill and the truck got a misfire code. Turns out a spark plug wire had come off and the Ultragauge helped me out by letting me know right then and there. Also a four cyl Tacoma is slow already, imagine one full of dirt and only running on three cyls lol.
     
    DustStorm4x4[QUOTED] likes this.
  5. Feb 29, 2016 at 11:29 AM
    #5
    gearcruncher

    gearcruncher Well-Known Member

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    They sure do
     
  6. Mar 1, 2016 at 6:40 AM
    #6
    JerzYota

    JerzYota [OP] Member

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    Interesting, Ultragauge is 69.95 and the other is $100 more. If the cheaper one will do what I need it to (give me specific info on check engine light) than it's a no brainer
     
    gearcruncher likes this.
  7. Mar 3, 2016 at 8:56 PM
    #7
    xplorn

    xplorn Well-Known Member

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    Wouldn't a cheap bluetooth reader (usually < $10) with the Torque phone app ($5) work? I know it reads everything, including codes, on a newer BMW so it seems like after you put in the Tacoma specs it would work. Makes for awesome custom dash panels.

    Not sure if it is available for Apple.
     
  8. Mar 4, 2016 at 3:50 PM
    #8
    MCObray

    MCObray Well-Known Member

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    I bought a ScanGauge II a few years back and have used it in every vehicle I have. I got the check engine light, utilized the SG2 by pulling the code (P1135), did some research and it ended up being the sensor. I bought the before-cat a/f sensor (Denso 234-9001 Air Fuel Ratio Sensor) and after-cat O2 sensor (Denso 234-4189 Oxygen sensor). Installed the a/f sensor, check engine light went away. I have heard the O2 sensor can throw a CEL shortly after, so I bought it as a precaution. Hope that helps!
     
  9. Mar 10, 2016 at 8:56 AM
    #9
    JerzYota

    JerzYota [OP] Member

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    Wow! This seems like the answer and under 20 bucks! I'll have to check this out, thanks
     
  10. Mar 10, 2016 at 9:00 AM
    #10
    Razgriz

    Razgriz wtf am i reading

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    One thing to keep in mind, is the scan/ultra gauges work in real time, and have their own screen.
    They will both tell you immediately if the OBD2 throws a code, but does not light the check engine light.
     
  11. Mar 10, 2016 at 9:27 AM
    #11
    127.0.0.1

    127.0.0.1 AKA ::1

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    yes but you still need to go to scangauge menu and hit scan to reveal pending codes

    nothing on scangauge will 'pop up' and show a code unless you ask it

    but yes scangauge is baller
     
  12. Mar 10, 2016 at 10:27 AM
    #12
    Trapperr

    Trapperr Well-Known Member

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    Does anyone like the ultra gauge over the scan guage?
     
  13. Mar 10, 2016 at 1:43 PM
    #13
    Razgriz

    Razgriz wtf am i reading

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    Ah
    The ultra gauge will pop up and tell you that there is a code. And sound an alarm on the unit. Very useful for telling me when i don't tighten the gas cap all the way.
     
  14. Mar 10, 2016 at 1:45 PM
    #14
    Trapperr

    Trapperr Well-Known Member

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    I'm heavily leaning towards the ultra gauge since I heard it can read auto trans temps.
     
  15. Mar 10, 2016 at 2:03 PM
    #15
    127.0.0.1

    127.0.0.1 AKA ::1

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    hmmm....scangauge can read both trans temps... hot side and cold side

    quite easily
     
  16. Mar 10, 2016 at 7:54 PM
    #16
    Trapperr

    Trapperr Well-Known Member

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    It sounds like I was misinformed on that.
     
  17. Mar 17, 2016 at 8:12 AM
    #17
    JerzYota

    JerzYota [OP] Member

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    Ok so I got a Bluetooth OBD2 adapter and downloaded EngineLink app

    Got the PO136 code. So which damn sensor is it?!?!? Front or rear O2 sensor?

    Getting pissed off that this particular gizmo I got doesn't tell you which one, which is the whole point of getting the frickin thing
     
  18. Mar 17, 2016 at 8:22 AM
    #18
    JerzYota

    JerzYota [OP] Member

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    AAAAAAAND now the ABS light is blinking too
     
  19. Mar 17, 2016 at 8:28 AM
    #19
    CD20H

    CD20H Well-Known Member

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  20. Mar 17, 2016 at 8:31 AM
    #20
    JerzYota

    JerzYota [OP] Member

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    Bank one sensor 2 is the sensor after the cat, yes?
     

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