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2008 Toyota Prius, how do I fix fault code P0420 OBDII?

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2008 Toyota Prius, how do I fix fault code P0420 OBDII? Catalyst system efficiency below threshold bank 1

Vehicle: 2008 Toyota Prius

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The Three-way Catalyst Converter is more than likely the cause of the problem.

P0420 2008 TOYOTA PRIUS - Catalyst System Efficiency Below Threshold Bank 1
Read more: https://www.autocodes.com/p0420_2008_toyota_prius.html

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