Wideband O2 sensor: why are mine failing?

Electrical & Ignition

  1. mrbone

    mrbone Well-Known Member

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    So, I have an APSX Wideband O2 Air/Fuel gauge connected to my exhaust immediately aft of the header collector. Two bung's welded vertical and at a 45 degree. This is the fourth O2 sensor that has failed in as many months.
    Anybody using the APSX brand gauge?
    The first two that went bad- I attributed to china, but now I am not so sure.
    Two failed on the vertical bung and now two on the 45 degree bung.
    Bosch, Denso and Chi-com sensors have all failed.

    Reached out to APSX but nothing..
    I'm ready to install a different brand and see if that does the trick.
    I know they fail from time to time, but this is nuts.

    Many Thanks!!
    Beep Beep
     
  2. moes

    moes Well-Known Member

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    excessive oil consumption, silicone from internal coolant leaks, using silicone sealant in the engine and some over-the-counter fuel additives can cause your O2 sensors to fail.
     
    • Agree Agree x 2
    • zyzzyx

      zyzzyx FBBO Gold Member FBBO Gold Member

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      And condensation can cause them to fail, hence the positioning if the bung. Lotsa things
      make them go PooF as stated above!
       
    • Hemirunner

      Hemirunner Well-Known Member

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      Thermal shock and leaded fuel will also do it. Using a heat sink style bung extender will help considerably.
       
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