Where is heated oxygen sensor bank 1 sensor 1 on 2002 Monte Carlo?

On a 2002 Monte Carlo, the heated oxygen sensor (O2 sensor) bank 1 sensor 1 is located in the exhaust manifold, upstream of the catalytic converter. It is typically positioned on the driver's side of the engine, where it monitors the oxygen levels in the exhaust gases before they enter the catalytic converter. Accessing it may require some maneuvering around other engine components.