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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
And the PCM has no clue that that particular sensor is lying to it. So, it interprets that the only way it knows how. Bank 1 is likely running excessively lean, so, the rest of the exhaust does as well.
Those are always the fun ones..... It's not a code that sets instantly though, the computer has to see the correct (incorrect???) conditions for X amount of time before it actually starts whining about it.