How do you change an O2 sensor on a 1996 Oldsmobile 88?

To change the O2 sensor on a 1996 Oldsmobile 88, first ensure the engine is cool and disconnect the negative battery cable. Locate the O2 sensor, which is typically found on the exhaust pipe or manifold. Use a wrench or O2 sensor socket to unscrew the old sensor, then install the new sensor by threading it into place and tightening it securely. Finally, reconnect the negative battery cable and start the engine to check for any error codes.