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OBD2 readers STFT questions on live data

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  • #987525
    David FieldsDavid Fields
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      Hello I am trying to understand readings of live data my Scanner ANCEL AD410

      I was looking at live data and I saw this
      Short Term Fuel Trim B1-S2 _
      Short Term Fuel Trim B2-S2 _

      I see also see
      Short Term Fuel Trim Bank 1 1.6%
      Long Term Fuel Trim Bank 1 -7.0%
      Short Term Fuel Trim Bank 2 2.3%
      Long Term Fuel Trim Bank 2 -7.8%
      Short Term Fuel Trim (B1-S1) 0.8%
      Short Term Fuel Trim (B2-S1) 2.3%

      what does it mean when you see it as _ which I assume means N/A

      I understand the ones with values for % but don’t know what _ means.
      do I have a O2 Sensor or clogged injector issue?

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