There are 2 O2 sensors, I think you could clear the code and swap the sensors to see if the problem follows.
Take a look at the EC section of the FSM for trouble shooting steps, link below;
https://www.nicoclub.com/FSM/370Z/Coupe/
From the FSM:
P2A00 or P2096 89H 84H
The amount of shift in air fuel ratio (too lean)
P2A00 or P2097 8AH 84H
The amount of shift in air fuel ratio (too lean)
The output voltage computed by ECM from the A/F sensor 1 signal is shifts to the lean side for a specified period.
Possible causes;
• A/F sensor 1 (bank 1)
• A/F sensor 1 heater
• Heated oxygen sensor 2 (bank 1)
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks