Trying to figure out why I’m not passing smog. OBD ll diagnostic.

  • waynep712222@alien.topB
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    10 months ago

    a quick look at that list shows your fuel trims WERE AT at 32%

    that is usually enough to fail the smog… anything over 19.9% sets a code…

    do you have a scan tool or obd2 dongle to check the live data and graph the oxygen sensor voltages…

    if yes… look at O2B1S1 and O2B2S1 voltages… take the rpm to 2500 and hold it steady. don’t move the pedal up or down… what do the waveforms look like… nice and clean…

    then slowly over 10 or 15 seconds return to idle… do the waveforms also look nice…

    if they do then look at the down stream sensors… O2B1S2 and O2B2S2 voltages… do this at 2500 again… do you see a voltage between 0.6 and 0.7 or a reduced waveform indicating the cats are reducing emissions…

    sending you a link… check Private messages…