oxygen

  1. H

    Oxygen sensor monitor

    Well hello to all the members. I have a 2011 Ram 2500hd 5.7 hemi with 146*** miles. I am in CA and I am trying pass SMOG but my O2 monitor is “NOT Ready”. I have no primary or secondary codes. I have followed the drive cycle many times already and no luck. I’ve looked over the forum and could...
  2. K

    How many Oxygen Sensors?

    So, do I have two, three, or four Oxygen sensors? 2005 Dodge Ram 1500 SLT 4WD Quad Cab 5.7 Hemi gasoline. In previous years I have changed two - one upstream ("before" the catalytic converter) and one "down". i THOUGHT that were all. But internet searches elsewhere than this forum hint at...
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