I have a g35 coupe rev up it’s a o5 an I need help figuring out if there more then 2 (02 Sensors) on my model Pls helpp,!,!

 

G35's have 4 O2 sensors.
One upstream O2 (before the catalyst) and one downstream O2 (after the catalyst) per bank.
Upstream are for measuring the fuel mixture for the ECU, downstream are for ensuring the catalytic converters are functioning.