Posts Tagged: symptom of a bad catalytic converter

Symptoms of a bad catalytic converter

January 19, 2021

What are the symptoms of a bad catalytic converter Check engine light and P0420 or P0430 trouble code is a sure symptom of a bad catalytic converter P0420 and P0420 trouble codes mean that your catalytic converter has failed the efficiency test. The test consists of rapidly changing the air/fuel mixture from lean to rich and back again and tracking the results with the pre-converter oxygen sensor and post converter sensor. That tells the computer how well the converter did it converting the extra fuel into CO and CO2 and … Read More