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Infiniti Forum: P0420 code
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Old 10-10-2018, 05:36 PM
dmarrs1 dmarrs1 is offline
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Default P0420 code

I had the bank 1 02 upstream sensor go out so I replaced but was quickly hit with the p0420 catalyst system efficiency below threshold. I replaced the downstream sensor but I still get the same code. I can’t believe that the converter is suddenly bad.
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Old 10-10-2018, 08:35 PM
marctronixx marctronixx is offline
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what year model is your car?
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Old 10-10-2018, 09:07 PM
dmarrs1 dmarrs1 is offline
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It’s a 2011
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Old 10-11-2018, 11:20 AM
marctronixx marctronixx is offline
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So did you have the recall done or did your vin not qualify?
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