I have a 2006 Dodge 2500 hemi 5.7 its throwing a code P0420 which is the catalyst system. I have had the catylac converter on bank 1 changed, I have also replaced all 4 O2 sensors.
po420 means catalyst efficiency. if factory parts were not used there is your problem . you should only be concerned with the two o2 sensors after the cat. or knowing chrysler a soft ware up date. the parameters in newer models are very tight, in the pcm
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