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.

Asked by Sep 29, 2015 at 10:37 PM about the 2006 Dodge Ram 2500 SLT 4dr Quad Cab 4WD SB

Question type: Maintenance & Repair

This all started after I had a magnaflo
muffler put on and 4 manifold bolts
replaced.

1 Answer

655

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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