Where is an o2 sensor on an 1998 for ranger 3.0?

On a 1998 Ford Ranger with a 3.0L engine, the oxygen sensors are located on the exhaust system. There are typically two sensors: one upstream (pre-catalytic converter) and one downstream (post-catalytic converter). The upstream sensor is usually found on the exhaust manifold or the exhaust pipe just after the manifold, while the downstream sensor is located after the catalytic converter. Be sure to check your vehicle's service manual for specific locations and details.