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P0420 code recently changed catalytic convertor on my 2003 Pontiac Grand Prix

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P0420 code recently changed catalytic convertor on my 2003 Pontiac Grand Prix and downstream 02 sensor, now engine light on

Vehicle: 2003 Pontiac Grand Prix

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Why did you change the catalytic converter and O2 sensor for? for the same code? Usually replacing the catalytic converter takes care of the P0420 code.

P0420 PONTIAC - Catalyst System Low Efficiency Bank 1
Read more: https://www.autocodes.com/p0420_pontiac.html

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