Where is the 02 sensor located on a 96 Cadillac STS?

On a 1996 Cadillac STS, the O2 (oxygen) sensors are located in the exhaust system. There are typically two sensors: one upstream (pre-catalytic converter) and one downstream (post-catalytic converter) on each bank of the engine. The upstream sensor is usually found near the exhaust manifold, while the downstream sensor is located further along the exhaust pipe, after the catalytic converter.