![How to Fix HONDA P0420 Engine Code in 3 Minutes [3 Methods / Only $19.99] - YouTube](https://i.ytimg.com/vi/D02jU2QKVHM/maxresdefault.jpg "How to Fix HONDA P0420 Engine Code in 3 Minutes [3 Methods / Only $19.99] - YouTube")
How to Fix HONDA P0420 Engine Code in 3 Minutes [3 Methods / Only $19.99] - YouTube
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Having a problem with the cats. Keeps reading a P0420 code after replacing the o2 sensors and the cat twice. Any ideas as to what could be causing this? : r/MechanicAdvice
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P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
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