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O2 Sensors

Discussion in '1st Gen. Tacomas (1995-2004)' started by Cdavis, Dec 9, 2010.

  1. Dec 9, 2010 at 11:49 AM
    #1
    Cdavis

    Cdavis [OP] Active Member

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    OME 2.5" Front, Rear add-a-leaf with extended shackles, Downey Super-clutch, 33" BFG MT
    So I just got a CEL for a Bank 1 Sensor 1, fuel air sensor... blah blah, and have been noticing decreased gas mileage. I just replaced my upstream 02 sensor, which turned off the CEL, but I was thinking, is there any benefit to replacing the downstream o2 sensor as well at this point? It was done about 95k miles ago, but obviously that's a long time. Would I possibly be getting any reduced mileage because of the downstream sensor, or would it possibly not be working well and not causing a CEL code?
     
  2. Dec 9, 2010 at 11:56 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    Yes. It can start to give diminished performance and not throw a code. It cant hurt to replace.
     
  3. Dec 9, 2010 at 12:14 PM
    #3
    Miata Tech

    Miata Tech Well-Known Member

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    The downstream (or secondary) O2 sensor does nothing but monitor catalytic converter efficiency. A bad,failed or even missing secondary O2 sensor will NOT effect fuel mileage or drivability.
     
  4. Dec 9, 2010 at 12:28 PM
    #4
    Cdavis

    Cdavis [OP] Active Member

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    Nice, thanks. I just filled it up and am interested to see the mileage on this tank with the new sensor. I have heard of some pretty drastic differences
     
  5. Dec 9, 2010 at 12:47 PM
    #5
    Cdavis

    Cdavis [OP] Active Member

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    OME 2.5" Front, Rear add-a-leaf with extended shackles, Downey Super-clutch, 33" BFG MT
    So to clarify, the downstream is only a monitor, gives no feedback to the CPU for engine performance?
     
  6. Dec 9, 2010 at 1:23 PM
    #6
    Miata Tech

    Miata Tech Well-Known Member

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    Yep. Anything after the cat is a monitor.
     
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