How do you change oxygen sensors for 2004 Chevy Express 2500?

To change the oxygen sensors on a 2004 Chevy Express 2500, first, ensure the vehicle is cool and safely elevated. Locate the oxygen sensors, usually positioned on the exhaust manifold and downstream of the catalytic converter. Disconnect the electrical connectors and use a specialized O2 sensor socket to unscrew the sensors. Install the new sensors by threading them in place, reconnect the electrical connectors, and clear any diagnostic trouble codes if necessary.