Where is the oxygen sensor located on a 2002 Chevy silverado?

The oxygen sensors are located in the exhaust manifolds or catalytic converters on all 2002 Chevy Silverados equipped with a V8 engine. There are four sensors in total, two on each side of the engine. The sensors are located near the outlet of the exhaust manifolds, behind the catalytic converters. To access the oxygen sensors, you will need to remove the catalytic converters or the exhaust manifolds.