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2000 Honda Odyssey CODE PO420.WHAT NEED TO BE REPLACE? ANSWER XXXXXXXXXXXXXX Code PO420 is catalytic converter efficiency low bank 1, sensor1. You did not state as to the year,make and model of the car as well as the engine size. I am a member of IATN and the majority of there fixes was related to someone installing an AFTER MARKET converter. There is a big difference. I strongly suggest that you go to a repair shop with the proper equipment as well as a very good tech to diagnosis the problem. You could replace parts and never fix the problem.jd1709

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Q: What needs to be repaired if you get the Code p0420 catalyst effeciency threshold low?
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