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Oxygen Sensor

Discussion in 'Technical Chat' started by beanders, Apr 1, 2007.

  1. Apr 1, 2007 at 12:04 PM
    #1
    beanders

    beanders [OP] Member

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    I just went past 80k miles. Should I replace both my oxygen sensors?
     
  2. Apr 1, 2007 at 1:38 PM
    #2
    007Tacoma

    007Tacoma I dub thee malicious!

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    I usually replace O2 sensors at 100,000 miles unless I get an error, but I inspect them every 20,000 miles.

    ...of course that is on all my older vehicles. My Tacoma shouldn't need that kind of maintenance for quite a while. ;)
     
  3. Apr 1, 2007 at 2:30 PM
    #3
    ForeRunner

    ForeRunner Hello, nice to meet you. Moderator

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    I'd say leave them in until you notice decreased fuel mileage or throw a CEL
     
  4. Apr 1, 2007 at 6:44 PM
    #4
    AUDITECH

    AUDITECH Carolina Alliance: LAZY DIVISION

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    As a tech unless your sensors are throwing codes i wouldnt worry about it. I have been known to have been wrong before. but until our O2 sensors throw codes they are good to go
     
  5. Apr 17, 2007 at 5:37 PM
    #5
    bowzerdoo77

    bowzerdoo77 U.S.M.C.

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    where are thw oxygen sensors located on an 04 v-6
     
  6. Apr 21, 2007 at 7:43 PM
    #6
    AUDITECH

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    locate the catalytic converter and there is going to be one in front and one behind it
     
  7. Apr 22, 2007 at 7:16 AM
    #7
    bowzerdoo77

    bowzerdoo77 U.S.M.C.

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    thanks are they expensive and easy to change? or for that fact what goes wrong with them causing them to need to be changed?
     
  8. Apr 22, 2007 at 3:32 PM
    #8
    twoarezee

    twoarezee Well-Known Member

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    on the 04 there is only one o2 sensor after the cats, the sensor before the cats is an air/fuel sensor. they are easy to change and some what expensive.
     
  9. Apr 22, 2007 at 4:56 PM
    #9
    AUDITECH

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    Why they go bad ia hard to say sometimes the sensors in them go out. Or they get trash of some sort or the wires go bad could be a number of reasons. the are not to hard to change you can get an o2 sensor socket or on the cars i work on a 22mm open end wrench is the right size. the only hard part is routing the wires back close to orginal location so they dont get damaged.
     
  10. Apr 25, 2007 at 10:03 PM
    #10
    twoarezee

    twoarezee Well-Known Member

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    toyota uses 2 studs to hold the sensors in. use oem sensors because they are plug and play so you dont need to worry about the wires because they will be in the sock location. www.urdusa.com has oem denso sensors.
     
  11. Apr 30, 2007 at 8:35 AM
    #11
    Steve762us

    Steve762us Well-Known Member

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    An air fuel sensor? Sure it's not a pre-cat O2 sensor--that the ECU compares with the post-cat O2 sensor, to verify cat operation?
     
  12. Aug 30, 2009 at 1:00 PM
    #12
    wsv3424

    wsv3424 New Member

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    looks like its normal to have to change the o2 sensors whenever they show code [lean bank one ] is it?
    think this 2000 has afr and o2 but diagram doesnt show that but forum folks say they do, confused .
    guess I'll check for vac leaks ,clean egr ,map and reset ,try again right ?
    if this is the case will mileage improve considerably? used to get around 22 hiway ,now maybe 15 .

    :confused:
     
  13. Aug 30, 2009 at 7:37 PM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    What exactly is the code?

    The sensor before the catalytic converter is an AFR (Air/Fuel Ratio) senor. The one after the catalytic converter is the O2 sensor. If the AFR is bad, it will definitely compromise you fuel mileage.
     
  14. Aug 30, 2009 at 7:54 PM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    On the first gens, the "Sensor 1" is an A/F sensor.
     
  15. Aug 31, 2009 at 9:06 AM
    #15
    spasur

    spasur Well-Known Member

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    how does that differ from an O2 sensor? It seems like they would both be doing the same thing, as a wideband O2 sensor is used to measure A/F...Is it just a new name for the same old thing?
     
  16. Aug 31, 2009 at 9:15 AM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It's actually a Californina specification. Non-Cali 4x4's got the O2 front and back. Cali trucks and 2wd have AFR and O2, according to the FSM anyway.

    http://www.ncttora.com/fsm/2000/Repair%20Manual/Emission%20Control/draw.pdf
     
  17. Aug 31, 2009 at 9:27 AM
    #17
    06Bluez

    06Bluez Well-Known Member

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    My O2 sensor for a 2nd gen cost about $150 for one!!! :mad:
     
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