PO420 Catalyst Efficiency Below threshold
#3
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if im not mistaken you will need to replace your cat. dodge has come out with a new cat warranty on some models. seen it the other day but dont actually remember which ones. would call and find out if i were you. you could get it replaced for free
#4
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I had the same problem about 4 months ago, and i had to get cat. converter replaced. And i believe the new warranty is 80000 miles for all vehicles
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#7
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#10
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hey guys need some help... my dakota has been running great but using alot of gas. 13 miles to a gal. it has a little 2.5 four cyl. in it. the check engine light comes on about every other week. code po420. the thing is that his has never happened before until i had to get a new computer for my truck cause the old one junked out on me. it use to get great gas mileage. then after i got a new computer they had to reprgram it cause they had a recall on it saying that it had the wrong os system on it. that when it all started. the truck has a new cat on it and a new muffler. it has a new o2 sensor on it and new throttle position sensor on it. everything is keeped up. the exhaust manifold has little cracks in it but they been there for about 3 years. and the new computer has been on there for only a year. what could be causing the PO420 code?