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Thread: Correct values from 1st O2 sensor

  
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    luke79's Avatar
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    Unhappy Correct values from 1st O2 sensor

    Which are correct values returned by the 1st oxygen sensor?
    Mine is floating from 10 to 760 mV at idle, and almost around 60/80 mV when at 2000 rpm.
    Is that ok?
    I already changed AFM 3 weeks ago. Car runs better, but I still have unstable power and sometimes a very bad idle (engine stalling). I suspect a bad correction in fuel trim maybe due to a faulty O2 sensor. Could it be possible?

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    Unhappy

    ok, I've monitored a bit more my O2 sensor.
    When at high load the max value I get is 925mV (means rich fuel trim?), when decelerating 10 or 5mV (lean?)

    When idleing it floats from 70 to 760mV.

    When bad idleing (under 500rpm) O2 is stuck to high values like 700/800mV instead of floating.

    Which is the cause, and which the consequence? A faulty O2 sensor reading rich instead of floating so the trim is corrected to lean and the engine stalls, or in spite of good readings from O2 sensor the trim is bad due to another thing ? --> the trim remain too rich and the engine stalls ?

    Do everybody understands what I'm trying to say ?

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    CRaggY ?

    Techie ?

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