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P0420 GMC -For my 2007 Pontiac G6, how do I know if it's the left or right catalytic converter?

Vehicle: 2007 GMC Pontiac G6 6 cylinder not sure of the displacement

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P0420 is for bank 1 which is near the firewall of the engine 

see picture below 

Pontiac G6 bank 1 location oxygen sensor bank 1 sensor 1

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