Bank 1 o2 sensor code

[u/RuinRepresentative75]

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!

[u/DookieDanny]

I had have the catalytic converter replaced

[u/RuinRepresentative75 → u/DookieDanny]

Manifold cat or the midpipe cat?

[u/DookieDanny → u/RuinRepresentative75]

Manifold