Where are oxygen sensors on Nissan 350Z?

On a Nissan 350Z, oxygen sensors are located in two main areas: the upstream (pre-catalytic converter) sensors are positioned on the exhaust manifold, while the downstream (post-catalytic converter) sensors are found on the exhaust pipes after the catalytic converters. The upstream sensors monitor the air-fuel mixture, while the downstream sensors check the efficiency of the catalytic converters. Accessing them typically requires some work under the vehicle or from the engine bay.