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How many o2 sensors are there?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Mxer256, Oct 22, 2012.

  1. Oct 22, 2012 at 3:45 PM
    #1
    Mxer256

    Mxer256 [OP] Well-Known Member

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    I was just wondering how many o2 sensors are on our truck. I went to advanced auto(will never go back again). They finally came to the conclusion that it was the upstream o2 sensor. I bought it because i know for a fact it is(Ive gone to orielly and autozone and got the same code but they told me it was o2 sensor)

    There are two catalytic converters...I see one after the second one and another inbetween them but cant tell if there is one on the headers or inside the engine bay.
     
  2. Oct 22, 2012 at 4:00 PM
    #2
    isu2014

    isu2014 RAT Products

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    View the build. Too much to list.
    There are 2. That's unfortunate you didn't like advance auto, they always have good prices and online coupons. I save tons through them.
     
  3. Oct 22, 2012 at 4:11 PM
    #3
    Mxer256

    Mxer256 [OP] Well-Known Member

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    Yeah i guess since im a teenager i get treated different. My dad prefers them over autozone but i will never go back there!

    And thanks for the help! Going to replace it now!
     
  4. Nov 6, 2012 at 7:37 PM
    #4
    ghs57

    ghs57 Well-Known Member

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    I can second the motion on advance auto by isu2014, I just had to do both o2 sensors on my Tacoma to pass NYS inspection, and they had the parts at a discount on line. I picked up the parts at the local store and was on my way in no time. Too bad your experience was negative.
     
  5. Apr 19, 2014 at 12:10 AM
    #5
    Mainmoe02

    Mainmoe02 Well-Known Member

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    Advance recognizes the upstream o2 sensor as the air/ fuel ratio sensor and the downstream is recognized as an o2 sensor. When I was looking for the part the guy couldn't find the upstream because he was using O2 sensor as the "key word search".
     
  6. Apr 19, 2014 at 5:29 AM
    #6
    StAndrew

    StAndrew Wait for it...

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    This is correct. Only have 1 02 sensor (after the cats) and 1 AFR sensor (before the cats).
     
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