
My '06 Dodge Dakota had codes P0420 and P0430 (Catalytic Converters Below Efficiency). Decided to replace the catalytic converters. It turned out that the old O2 sensors were worn out. After installing four new Denso O2 sensors, the codes disappeared. Cheap repairs for less than $100 (all four sensors) instead of replacing catalytic converters ($500-$1,000).

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