What does P0420 on a Lexus ES330 means?

What does P0420 on a Lexus ES330 means?
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1 Answer

Answer :

P0420 = Catalyst System Efficiency Below Threshold Bank 1.Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic converter needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.
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