Rick's Free Auto Repair Advice

Posts Tagged: exhaust plugged

Fix Code P0420

Fix Code P0420 A P0420 code means your catalytic converter has failed an efficiency test. In other words, it’s not removing harmful combustion byproducts from the exhaust. Many people think that the way to fix code P0420 is to replace the oxygen sensors. That’s wrong. In fact, the vehicle comuter can’t even come to the conclusion that your catalytic converter has failed the efficiency test if your oxygen sensors are bad. So don’t waste your time and money on oxygen sensors. What goes wrong with a cat converter? Catalytic converters … Read More


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