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Posts Tagged: causes catalytic converter failure

What causes catalytic converter failure and P0420

Causes of catalytic converter failure and P0420 A P0420 trouble code Catalyst System Efficiency Below Threshold (Bank 1), and P0430 Catalyst System Efficiency Below Threshold (Bank ) usually mean you’ll be in the market for a new catalytic converter. Yes, I know that many online sites tell you to fix a P0420 with a new oxygen sensor. In rare cases, that might fix the problem. But for the vast majority, replacing the oxygen sensor is really wishful thinking and a waste of money. So let’s take a look at what … Read More


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