How do you replace the 02 sensor on a 2002 Pontiac grand prix 3.1l?

To replace the O2 sensor on a 2002 Pontiac Grand Prix with a 3.1L engine, first, ensure the vehicle is cool and then disconnect the negative battery cable. Locate the O2 sensor, which is typically found in the exhaust manifold or downstream in the exhaust pipe. Use an O2 sensor socket to unscrew the old sensor, then install the new sensor by threading it in and tightening it securely. Finally, reconnect the battery cable and check for any engine codes.