Clear check battery not charging code on 98' jaguar XK8?

To clear the "battery not charging" code on a 1998 Jaguar XK8, first ensure that the battery and alternator are functioning properly. Disconnect the negative battery terminal for about 15 minutes to reset the car's computer. Reconnect the terminal and start the vehicle to see if the warning light has cleared. If the code persists, it may indicate an underlying issue with the charging system that needs further diagnosis.