Where is the oxygen sensor at in a ford freestar?

In a Ford Freestar, the oxygen sensors are typically located in the exhaust system. There are usually two sensors: one upstream (pre-catalytic converter) and one downstream (post-catalytic converter). The upstream sensor is often found near the engine's exhaust manifold, while the downstream sensor is located further along the exhaust pipe, after the catalytic converter. Accessing them may require lifting the vehicle or removing certain components for better visibility.