Question about 2005 Dodge Ram 1500
P0420 indicates that there is a catalytic converter inefficiency. Although its not a bad idea to replace the downstream O2 to see if that is the problem, the true problem is usually the catalytic converter itself.
I'm pretty sure Chrysler has an 8 year 80,000 mile emissions warranty that would cover the catalytic converter. Sometimes they extend them to even longer intervals. If you close to that mileage it may not hurt give the dealer a call.
Posted on Apr 04, 2011
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Posted on Jan 02, 2017
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