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OBD2 readers STFT questions on live data

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This topic contains 0 replies, has 1 voice, and was last updated by David Fields David Fields 2 years, 11 months ago.

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    David Fields
    David 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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