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How do I test a 2005 Nissan Altima p0420 sensor?

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How do I test a 2005 Nissan Altima p0420 sensor?

Vehicle: 2005 Nissan Altima 2.5L

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A P0420 code is telling you that your catalytic converter isn't working properly. To diagnose it properly you need a scan tool with live data and a scope.

Read this post on what causes a P0420

http://ricksfreeautorepairadvice.com/p0420-catalyst-system-efficiency-below-threshold/

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