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o2 and air fuel ratio sensor......

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TOYOTA 09, Jan 26, 2012.

  1. Jan 26, 2012 at 1:25 PM
    #1
    TOYOTA 09

    TOYOTA 09 [OP] Kicking Ass Since 1981

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    check engine light and vsc light came on the other day. took the tuck to the dealer and they fixed it. said that o2 sensor and air/fuel ratio sensor had blown. would have cost $600 if i was out of warranty. starting to wonder how much out of pocket money ill have to spend on this truck when my warranty runs outs. has this happened to anyone yet?
     
  2. Jan 26, 2012 at 4:06 PM
    #2
    maineah

    maineah Well-Known Member

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    Sounds like they did not know the difference and replaced both till they go it right.
     
  3. Jan 27, 2012 at 4:14 AM
    #3
    TOYOTA 09

    TOYOTA 09 [OP] Kicking Ass Since 1981

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    So I'm the first that this has happened to on this board?
     
  4. Jan 27, 2012 at 4:18 AM
    #4
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    Can we hook an AFR gauge up to that sensor?
     
  5. Jan 27, 2012 at 4:23 AM
    #5
    buddywh1

    buddywh1 Well-Known Member

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    O2 sensor replacement should not exceed $200; if you do it yourself (and it's pretty easy) cost could be as little as $65. I'm wondering what they mean with an 'air/fuel ratio sensor' cause that's what the O2 sensor is.

    I have no idea what any of this has to do with Vehicle Stability Control, if that's what the vsc light was..
     
  6. Jan 27, 2012 at 4:32 AM
    #6
    the.sight.picture

    the.sight.picture Well-Known Member

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    i have a 2005 taco trd dcsb auto trans. with 147,xxx miles.lets see, i replace both o2 sensors. 59.99 a piece.2 weeks ago. original equipt. i replace origanal transmission, 2,000 miles ago. Trans came out of a 2007 wreck with only 11,000 miles on it. $1300 plus 650 for install.2 year parts and labor warrenty.

    FYI, for parts you would be much better off if u buy mayor $ stuff out of wrecks. toyota told me $3900 for trans and 950 for install.

    DO Your own maintance. Saves you more $
     
  7. Jan 27, 2012 at 4:36 AM
    #7
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    I have an air fuel sensor in my car. It's a wide band o2 and has a gauge with it to monitor AFR when playing around with the fuel maps on the piggyback ecu to get mixture right. Thinking they misspoke. No one here has ever posted up about having or exploiting this feature on a Tacoma that I've read about.
     
  8. Jan 27, 2012 at 4:38 AM
    #8
    the.sight.picture

    the.sight.picture Well-Known Member

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    if you are gonna take them out, you might as well replace them. Amazon.com is my fav for emissions parts. for 02 sensors, you can use an O meter from wally world like 20 bucks, and test the wave forms per the service manual
     
  9. Jan 27, 2012 at 4:50 AM
    #9
    T@co_Pr3runn3r

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    Sorry, was just messin around with how the dealer worded what they told the OP. Wasn't really asking. I know they actually do that but it's not really worded that way unless you wanna justify it being so expensive to fix usually.
     
  10. Jan 27, 2012 at 5:20 AM
    #10
    buddywh1

    buddywh1 Well-Known Member

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    For $600 it sounds the dealer best have done more than just an O2 sensor... maybe MAF and OP didn't quite get the explanation?

    OP also said the vsc light was on so it suggests something completely aside from an engine control was repaired too.

    It's just confusing.
     
  11. Jan 27, 2012 at 3:24 PM
    #11
    Tacoma Mike

    Tacoma Mike 42 Year Toyota Master/ASE Master Tech.

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    not confusing at all once you understand the system a little.

    Anytime the check engine light comes on it will deactivate the VSC because they share inputs from the engine ecu. Since they are intertwined they don't want false signals going to vsc. It's a fail safe.

    Also:

    AF sensor is not the same as a 02 sensor.

    They do go out from time to time.
     
  12. Jan 27, 2012 at 4:15 PM
    #12
    maineah

    maineah Well-Known Member

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    X2
     
  13. Jan 28, 2012 at 7:24 AM
    #13
    buddywh1

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    Interesting about VSC light...

    So just where is the air/fuel sensor? Can't find a reference in the TSM and other than an O2 I've never heard of one so I'm thinking there may be an AKA...
     
  14. Jan 28, 2012 at 8:40 AM
    #14
    Tacoma Mike

    Tacoma Mike 42 Year Toyota Master/ASE Master Tech.

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    AF sensor is before the cat converter. O2 is after.

    AF monitors exhaust and adjust fuel trim accordingly. It's not an exclusive input but is heavy in it's relationship.
    O2 monitors the cat primarily and it's ability to do it's job.

    So for a V6.

    Bank one sensor 1 Bank two sensor 1 are AF sensors
    Bank one sensor 2 Bank two sensor 2 are O2 sensors.
     
  15. Jan 29, 2012 at 4:25 AM
    #15
    buddywh1

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    I got ya... the A/F sensor is AKA the upstream O2 sensor, which is the way I know it. Never quite thought of it that way before but it does make sense :thumbsup:
     
  16. Jan 29, 2012 at 4:31 AM
    #16
    Tacoma Mike

    Tacoma Mike 42 Year Toyota Master/ASE Master Tech.

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    Yea they keep on changing the dam names on everything. But i learned upstream / downstream also. I think they have room full of people and their only job is to make new names for stuff just to qualify their existence.
     
  17. Jan 29, 2012 at 4:42 AM
    #17
    Boerseun

    Boerseun Well-Known Member

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    OP, I don't think you have worry about out of pocket expenses too much. My truck is 10 years old and I have literally not spent one penny on repairs. I have done oil changes, brake pads, tires and wiper blades.
    That was until last week. It must be the season for AF / O2 sensors, because my check engine light came on for the first time in 10 years, and it is the upstream sensor. I have ordered it online for about $80 and will install it myself. There have been quite a few posts recently about these sensors and error codes.
     
  18. Jan 29, 2012 at 8:57 AM
    #18
    Night

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    Things happen in waves. The P2197 code in our highlander came on just a few days ago. The VSC does come on with the check engine.
     
  19. Feb 21, 2012 at 8:20 AM
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    Bryan139

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  20. Feb 21, 2012 at 8:24 AM
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    Bryan139

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