Posts Tagged: test a catalytic converter

What to Do When You Get a P0420 Catalytic Converter Code

What to check when you get a P0420 or P0430 code Quick Summary: If your check engine light shows a P0420 catalytic converter code or a P0430 trouble code, don’t assume the oxygen sensor is bad. These codes almost always mean your catalytic converter isn’t doing its job efficiently — but the root cause is usually elsewhere. Before spending money, I’ll walk you through how I diagnose and confirm what’s really wrong so you don’t replace the wrong parts. Why a P0420 or P0430 Code Rarely Means a Bad Oxygen … Read More