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Posts Tagged: P0430

How to fix Code P0420

What is code P0420 Catalyst System Efficiency Below Threshold When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. After the tests you may indeed discover that the catalytic converter is bad. But first you have to understand how the air/fuel and emissions systems work. How the air and fuel mixtures are calculated The powertrain control module (PCM) receives inputs from the engine coolant temp … Read More

P0420 P0421 P0422 P0423 P0424 P0430 P0431 P0432 P0433 P0434

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

Fix code P0430

Code P0430 Catalyst System Efficiency Below Threshold (Bank 2) NOTE: Codes P0420 and code P0430 are similar. I wrote a much more detailed explanation of how an emission system works and what causes these codes. Read this post and then refer to this more detailed post. Code P0430 means the catalytic converter that treats the exhaust for Bank 1 has failed it’s testing. The oxygen sensor in front of the catalytic converter switches back and forth between rich and lean as the computer constantly changes air fuel mixture. But after … Read More

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