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System checked with scan tool all readings correct. Still getting p0420 code why?

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New Dealer installed Cat.
New AC Delco Secondary O2 Sensor

Vehicle: 2010 Buick Lacrosse 3.0

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P0420 Catalytic below threshold Bank 1

When a CK ENG LT comes on it stores a freeze frame data, this is where the scan tool data is valuable and will give a insight to why the catalytic convertor has set a code.

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