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  1. 4th Generation Chrysler Minivans: 2001-2007
    I have an 06 T&C 3.8L and its been throwing a P0420 catalyst system efficiency below threshold bank 1 code. I have replaced both front and back O2 sensors after reading that the code could be the sensors & to try that first to see if its just the sensors. I did a big tune up while replacing the...