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code P0420 is set when the computer detects a fault in the three way catalytic converter circuit.
there is a oxy sensor before and after that cat, and if the sensors do not read what they are supposed to be, it sets a code 420, which could be a failed sensor, or a failed catalytic converter, or a failure in wiring.
Depending on high mileage or not, it is most often the cat worn out or, a sensor worn out.
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