Rick's Free Auto Repair Advice

Posts Tagged: test a catalytic converter

P0420 — Test a catalytic converter

Test a catalytic converter So you have a check engine light with either a P0420 or P0430 and you want to know if the problem is an oxygen sensor or the catalytic converter. First, it’s almost never an oxygen sensor. How do I know that? Because the computer switches the oxygen sensors rapidly in order to test the catalytic converter.   If the oxygen sensors aren’t working properly, the computer would set oxygen sensor codes and it wouldn’t be able to complete the catalytic converter test. So here’s how to test … Read More


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