Where is bank 1 sensor 1 located in 02 Cadillac deville?

In a 2002 Cadillac DeVille, the Bank 1 Sensor 1, which is the upstream oxygen sensor, is located on the driver's side of the engine. It is positioned in the exhaust manifold, before the catalytic converter. This sensor monitors the oxygen levels in the exhaust gases to help the engine control module optimize fuel injection and emissions.