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What does the engine code P0420 Bank 1 mean on my 2003 Nissan Xterra?

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What does the engine code P0420 Bank 1 mean on my 2003 Nissan Xterra?

Vehicle: 2003 Nissan Xterra

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It means that the catalytic converter is not working properly.

Read more about the catalytic converter here: https://www.autocodes.com/articles/catalytic-converter.php

P0420 Nissan - Catalyst System Efficiency Below Threshold Bank 1
Read more: https://www.autocodes.com/p0420_nissan.html

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