Where are the upper and lower oxygen sensors engine location for a 2000 s-10?

In a 2000 Chevrolet S-10, the upper oxygen sensor, also known as the upstream sensor, is located in the exhaust manifold or just before the catalytic converter. The lower oxygen sensor, or downstream sensor, is positioned after the catalytic converter in the exhaust system. Both sensors are critical for monitoring exhaust gases and ensuring proper engine performance and emissions control.