Posts Tagged: What Causes Catalytic Converter Failure

Understanding What Causes Catalytic Converter Failure

What Causes Catalytic Converter Failure Codes P0420 or P0430 When I first encounter a check-engine light and a P0420 or P0430 trouble code, I don’t automatically condemn the catalytic converter. I’ve learned over the decades that catalytic converter failure almost always traces back to upstream components. In other words, most catalytic converters don’t die on their own; they’re murdered by improper engine operation. If you don’t diagnose the underlying cause of the failure, your replacement converter will fail in the same way. For example, mistaking a failing sensor or a … Read More