Rick's Free Auto Repair Advice

Posts Tagged: P0431

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Fix code P0420 P0421 P0422 P0423 P0424 P0430 P0431 P0432 P0433 P0434 Some blog readers have been asking if they really have to replace a $1,200 catalytic converter just because they’re seeing these codes. Perhaps not. But before I dig into what may be causing the problem, let’s do a quick explanation of exactly what a catalytic converter does and how it may fail. Inside the catalytic converter you’ll find a honeycomb coated with rare-earth metals like Rhodium, cerium, platinum, and palladium. These metals react with oxygen, fuel, oil, to … Read More


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