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Help needed for a live reading of rear o2 sensor (bank 1 sensor 2)

Discussion in 'Technical Chat' started by geoff06, Nov 18, 2011.

  1. Nov 18, 2011 at 11:10 AM
    #1
    geoff06

    geoff06 [OP] Well-Known Member

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    Vehicle:
    01 PreRunner Xcab lifted
    3" lift, Sway-A-Way Racerunner coilovers, rear AAL, Rough Country 9000 rear shocks, 265/75/16 AT's on stock steels painted black, All-Pro 1.5"F/1.25"R wheel spacers, airbox elbow mod, Flowmaster Super 44, Davico post-cat, DIY angle iron bed/light bar, bumper-mounted halogen offroad lights, bed wheel well shovel-mount, blacked out grill emblem, Poineer DEH-P3900 head unit, Alpine Type R front component speakers, Pioneer Coaxial rears, Dynamat in door panels, scratchbuilt aluminum holders for my ipod nano and phone, and for some reason, I painted the headlight fillers black...
    I have a 219k '01 xtracab 2.7l. I've been getting a CEL with a p0136 code (oxygen sensor malfunction, bank 1 sensor 2) for the last 2 weeks. I have reset the codes/ecu 3-4 times and the codes keep coming back. The only consistency regarding when the CEL comes on is when I have about 3 gallons of gas left. At first I thought the light was only coming on when doing 67mph+/2200rpm, but it just came on while doing about 30mph.

    I went to my buddy's house and he got a live reading of exhaust/emissions flow with his scan tool and we noticed something that didn't look right- the reading for the upstream o2 sensor was hovering around 3.2xx but the reading for the downstream 02 sensor just said "0" and didn't change, which seemed suspicious. I have a URD o2 "simulator" (which is basically a conditioner, working in conjunction with the downstream o2 sensor) with one cat and until now, my truck has been running absolutely amazingly since I installed it 3 months ago.

    Ok that's all the info that I can think of. My question is this-- can somebody please get a live reading from their 01-04 Taco and tell me what that number for a functioning downstream o2 sensor is supposed to be? I don't wanna waste my time and money replacing an oxygen sensor that still works (yeah yeah, I know, it's a freaking high mileage sensor and definitely most likely the problem, but money is tight and I wanna know everything I can before going out in the freezing cold to work on my truck)

    Thanks guys!
     
  2. Nov 18, 2011 at 4:39 PM
    #2
    BUZZCUT

    BUZZCUT Well-Known Member

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    That sensor is junk.

    The sensor in question won't cause drive-ability problems. It is there to monitor the efficiency of the converter. the light will return every time you reset it due to the sensor being junk. Until you pull the light bulb the light will shine. You change the sensor it should stay off unless you have other codes.
     
  3. Nov 19, 2011 at 8:51 PM
    #3
    geoff06

    geoff06 [OP] Well-Known Member

    Joined:
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    Vehicle:
    01 PreRunner Xcab lifted
    3" lift, Sway-A-Way Racerunner coilovers, rear AAL, Rough Country 9000 rear shocks, 265/75/16 AT's on stock steels painted black, All-Pro 1.5"F/1.25"R wheel spacers, airbox elbow mod, Flowmaster Super 44, Davico post-cat, DIY angle iron bed/light bar, bumper-mounted halogen offroad lights, bed wheel well shovel-mount, blacked out grill emblem, Poineer DEH-P3900 head unit, Alpine Type R front component speakers, Pioneer Coaxial rears, Dynamat in door panels, scratchbuilt aluminum holders for my ipod nano and phone, and for some reason, I painted the headlight fillers black...
    Yeah after typing that I realized that there probably wasn't even much point in asking the question, cuz all the evidence points to a fried sensor. Starts with a p0136 then the infamous p0420 bbq'd gato code shows up after a while, which can be/is a result of the 136. I just reset the ECU to see if the same code(s) would show up each time, and they did. Ha, yeah I know, I'm paraniod and ocd, but whatever. So, on to ordering a new o2 sensor for myself...
    Thanks
     
  4. Nov 19, 2011 at 8:54 PM
    #4
    joes06tacoma

    joes06tacoma Well-Known Member

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    Central Coast, CA
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    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    Can you swap the sensor with one of the other ones on the truck and see if the sensor readings change? If nothing changes you may have a wiring problem.
     
  5. Nov 23, 2011 at 1:00 PM
    #5
    geoff06

    geoff06 [OP] Well-Known Member

    Joined:
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    Member:
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    Messages:
    256
    Gender:
    Male
    WI
    Vehicle:
    01 PreRunner Xcab lifted
    3" lift, Sway-A-Way Racerunner coilovers, rear AAL, Rough Country 9000 rear shocks, 265/75/16 AT's on stock steels painted black, All-Pro 1.5"F/1.25"R wheel spacers, airbox elbow mod, Flowmaster Super 44, Davico post-cat, DIY angle iron bed/light bar, bumper-mounted halogen offroad lights, bed wheel well shovel-mount, blacked out grill emblem, Poineer DEH-P3900 head unit, Alpine Type R front component speakers, Pioneer Coaxial rears, Dynamat in door panels, scratchbuilt aluminum holders for my ipod nano and phone, and for some reason, I painted the headlight fillers black...
    Na, I can't swap it out with another one. I mean the thing does have 219k miles on it... it is original and will most likely have to get cut off/out since the mounting studs and nuts are basically fused together/to the pipe with rust
     
  6. Nov 23, 2011 at 1:57 PM
    #6
    geoff06

    geoff06 [OP] Well-Known Member

    Joined:
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    Male
    WI
    Vehicle:
    01 PreRunner Xcab lifted
    3" lift, Sway-A-Way Racerunner coilovers, rear AAL, Rough Country 9000 rear shocks, 265/75/16 AT's on stock steels painted black, All-Pro 1.5"F/1.25"R wheel spacers, airbox elbow mod, Flowmaster Super 44, Davico post-cat, DIY angle iron bed/light bar, bumper-mounted halogen offroad lights, bed wheel well shovel-mount, blacked out grill emblem, Poineer DEH-P3900 head unit, Alpine Type R front component speakers, Pioneer Coaxial rears, Dynamat in door panels, scratchbuilt aluminum holders for my ipod nano and phone, and for some reason, I painted the headlight fillers black...
    just ordered a Denso downstream o2 sensor from Rockauto w/ the Tacoworld discount. Good price and the have a good return policy, so I should be ok if I find a different cause to the problem before the part gets here
     
  7. Nov 29, 2011 at 4:49 PM
    #7
    HuckleSmothered

    HuckleSmothered Member

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    Did that O2 sensor fix the error code?
     
  8. Nov 30, 2011 at 4:57 AM
    #8
    Gadget@URD

    Gadget@URD Well-Known Member Vendor

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    Southern Maryland USA
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    Remove the URD Sim. See if the problem continues. If so, replace the sensor.

    If not call URD.

    URD carries the full line of Denso O2 sensors as well.

    G
     
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