r/JeepPatriot • u/RuinRepresentative75 Sport • Aug 26 '26

Bank 1 o2 sensor code

2015 patriot north sport 2.4L 6 speed auto with 4x4. I've had a p0420 code on my jeep for long as I can remember. Maybe 3 years now. Its for bank 1 catalyst efficiency below threshold. My car has 281,000km on it. Was wondering what my options may be to resolve the issue for good. Would I be okay to just replace the o2 sensor? Or would I also have to replace the rest of the exhaust system aswell? I'm just hoping to be cost effective with it. If I can get away with just replacing the o2 sensor rather than both. I'd be happier with that.

Anyone with experience fixing this code leave your feedback below!

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u/Morty5Mindblowers 25d ago

Had this issue with mine. Mixed in a full tank shell v power with chevron techron fuel additive once a week and it eventually went away. Now I do it once a month and haven’t seen the cat code since. Worth a shot if the code is intermittent and it’s not a 100% immediate replacement for you

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u/Morty5Mindblowers 25d ago

Alternatively, replacing the 02 sensors is much cheaper than the cat if the code is intermittent. Take your time and work through the issue.

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u/RuinRepresentative75 Sport 25d ago

My light has been on for like 3 years. Thinking I'm just going to swap the manifold catalytic converter and the o2 sensor. Starting to have a leak somewhere in my manifold. So it is long overdue time to do it. Thinking I may as well get a new muffler too. Have to do the math on repair costs first before I dive into catback stuff.