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The code indicates the catalytic converter isn't working properly. Replacing the oxygen sensors may sometimes fix the problem, but in most cases the catalytic convert needs to be replaced.
Here are two links. The first discusses symptoms of a bad converter. The second shows how to check the converter.
The picture I attached comes from Alldata and shows possible causes of this code. Take a look at it. Next, there are other things which can cause it other than a bad converter. Leaking fuel injector, faulty spark plugs, ignition timing, clogged air filter, are all possibilities.
Check the things I mentioned and let me know what you find. I hope this helps.
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Thursday, September 20th, 2018 AT 7:22 PM