P0420 Error Code

Civic 2016+ 1.5 Turbo
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Rose
Posts: 3
Joined: Fri Mar 25, 2022 10:04 pm

P0420 Error Code

Post by Rose »

Hey there,

Recently upgraded to a new downpipe which has replaced the catalytic converter it seems, as I am now pulling a P0420 Code: which is basically the secondary 02 sensor reading that the emissions aren’t being filtered correctly by the catalytic converter (which makes since since that whole piece has been replaced lol)

Still drives fine of course, so I am curious if it would be safe to simply turn off the secondary o2 sensor in Hondata and reflash the ecu.
Would this turn off the check engine emissions light, and would it be safe to do so?

Appreciate the help :)
2018 , Honda Civic , 1.5L , EX-T , Injen CAI , Injen SES 3" Cat-Back Exhaust , SiriMoto PnP E85 Flex Fuel Kit , Stage 3 Clutch Kit w/ Ultra Light Flywheel , Sirimoto N1 Clutch Master , MAPerformance Catted Downpipe
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Spunkster
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Posts: 22740
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: P0420 Error Code

Post by Spunkster »

If this is a race vehicle then you should be able to disable this.
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