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O2 sensor help needed

Discussion in '1st Gen. Tacomas (1995-2004)' started by donlogan, Oct 5, 2017.

  1. Oct 5, 2017 at 2:05 PM
    #1
    donlogan

    #1
    donlogan [OP] Well-Known Member

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    I'm trying to replace what I believe is the 'downstream' Oxygen sensor in my 1995 Tacoma, 2.4L.

    Before I opened up the packaging I wanted to just make sure I am doing the right one.

    Upstream O2 sensor is the one closer to the cab right? And the downstream O2 sensor is the one further down...as in from the direction that the exhaust fumes flows.
     
    donlogan, Oct 5, 2017
    #1
  2. Oct 5, 2017 at 2:09 PM
    #2
    Radarninja

    #2
    Radarninja Safety 3rd

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    Northern California
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    Chromed out radiator cap
    Yup
     
    Radarninja, Oct 5, 2017
    #2
  3. Oct 5, 2017 at 2:11 PM
    #3
    wheeliest

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    wheeliest ///////////////////

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    upstream = before cat, downstream = after cat
     
    wheeliest, Oct 5, 2017
    #3
  4. Oct 5, 2017 at 2:12 PM
    #4
    tomtraubertsblues

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    tomtraubertsblues Well-Known Member

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    Downstream is after the catalytic converter.
     
    tomtraubertsblues, Oct 5, 2017
    #4
  5. Oct 6, 2017 at 5:48 PM
    #5
    ghs57

    #5
    ghs57 Well-Known Member

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    Wasn't there only a downstream O2 sensor on the '95? IIRC, they didn't add the upstream A/F sensor until later. I've only had 2.7Ls though, and my '97 only had a downstream.
     
    ghs57, Oct 6, 2017
    #5

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