Where is the Oxygen sensor located in the engine of a 1997 Oldsmobile Regency engine?

In a 1997 Oldsmobile Regency, the oxygen sensor is typically located in the exhaust system. Specifically, you can find the upstream oxygen sensor (pre-catalytic converter) positioned on the exhaust manifold or the exhaust pipe just before the catalytic converter. There may also be a downstream sensor (post-catalytic converter) located further down the exhaust system. Always refer to the vehicle's service manual for precise locations and specifications.