How do you replace oxygen sensors on 2001 Infiniti QX4?

To replace the oxygen sensors on a 2001 Infiniti QX4, start by locating the sensors, which are typically found on the exhaust manifold and downstream in the exhaust system. Disconnect the battery to ensure safety, then unplug the old oxygen sensor connectors. Use an oxygen sensor socket or wrench to unscrew the sensors from their respective locations, then install the new sensors by threading them in and tightening securely. Finally, reconnect the electrical connectors and the battery, and clear any error codes if necessary.