Posts Tagged: symptom of a bad catalytic converter

Symptoms of a bad catalytic converter

Bad catalytic converter symptoms Check engine light on with P0420, P0430 trouble code is a 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 catalytic converter did it converting the extra fuel into CO and CO2 and how well it did in … Read More