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2013 Dodge Grand Caravan
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You didn't change the intake gasket, did you?

And you got the codes mixed up. P0420 is bank 1 cat. P0455 is a large EVAP leak.
 

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2013 Dodge Grand Caravan
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Only part of the system you haven't replaced is the Purge Valve right by the air box (and the lines that connect everything). It's the #2 cause for those codes (gas cap is #1).
 
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