How do you remove upper oxygen sensor 2004 corolla?

To remove the upper oxygen sensor from a 2004 Toyota Corolla, first ensure the vehicle is turned off and the engine is cool. Disconnect the negative battery terminal to prevent any electrical issues. Locate the upper oxygen sensor on the exhaust manifold, then unplug the electrical connector. Use an oxygen sensor socket or a wrench to carefully unscrew and remove the sensor from its mounting location.