code po420

Question

2006 NISSAN PATHFINDER, CHANGED OUT CATS, OLI CHANGE, PLUGS, FILTER, AND O2 SENSOR. NOW THROWING COEDS PO420. WHAT WOULD CAUSE THIS,M AND HOW TO FIX IT. PLEASE HELP ME.
THANK YOU
CHERI
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Answer 1

HI there,

first, make sure the right converters were replaced. The converter right off the exhaust manifold. What I have seen is the rear converter being replaced instead of the front one. This will cause this code. I also think that you should try a different gas station. Most of the time however the wrong converter is the problem.