Location of 02 sensor (bank 2) for 2000 Nissan Maxima? on 2000 Nissan Maxima

P0430 code reading 'Catalyst System Efficiency Below Threshold Bank 2". Whould like to replace them.

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Hello the front of the engine next to the radiator is bank [2] but before you replace the oxygen sensor after the catalytic coverter which is the bank [2] sensor [2] you need to check the cross counts.I suspect the catalytic converter is not working properly.
Thanks for the location of the sensor. However, I do not understand what you mean "check the cross counts". Will you explain?

Thanks again