How do you replace oxygen sensor in a 2000 Nissan altima?

To replace the oxygen sensor in a 2000 Nissan Altima, first locate the sensor, which is typically found on the exhaust pipe or manifold. Disconnect the negative battery terminal, then unplug the old oxygen sensor's electrical connector. Use a wrench or oxygen sensor socket to unscrew the old sensor, then screw in the new sensor and reconnect the electrical plug. Finally, reconnect the battery terminal and start the engine to ensure proper operation.