How many O2 sensors are on a 92 Chevy C1500 with V6 4.3L engine and where the located.?

A 1992 Chevy C1500 with a 4.3L V6 engine typically has one oxygen sensor. It's located in the exhaust system downstream of the catalytic converter. The exact location will vary slightly depending on the specific exhaust routing, but it's generally towards the rear of the vehicle, before the exhaust exits.