What Does Po420 Engine Code Mean

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CHEAP and EASY FIX of code PO420. Catalyst Efficiency below threshold

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What does po420 engine code mean

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Cheap and easy fix of code po420. catalyst efficiency below threshold

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What does po420 engine code mean

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I have an ongoing po420 engine code on my 2002 nissan frontier(2.4). iWhat does po420 engine code mean I got a check engine code po420, has anyone had the same problem ? if.