Where are located the o2 sensors in a ford ranger 99?

In a 1999 Ford Ranger, the oxygen (O2) sensors are located in two primary positions. The upstream O2 sensor is found in the exhaust manifold, before the catalytic converter, while the downstream O2 sensor is located after the catalytic converter in the exhaust system. These sensors monitor the oxygen levels in the exhaust gases to help optimize engine performance and emissions.