Where are the o2 sensors on a 98 mercury mountaineer?

On a 1998 Mercury Mountaineer, the oxygen (O2) sensors are located in two main positions: the upstream (pre-catalytic converter) sensors are found on the exhaust manifolds, typically one on each side of the engine, and the downstream (post-catalytic converter) sensors are located after the catalytic converters along the exhaust pipes. To access them, you may need to raise the vehicle for better visibility and reach. Ensure to disconnect the battery before replacing the sensors to avoid any electrical issues.