Rory Fraser

hey guys so i tried searching and have found no prblem like mine basically my engine light came on for 2 codes and i think i found the problem for both but i dont know what to do so basically the hose coming from the sensor is fine but what is the problem is the metal tube where it connects has broken off into the hose i dont know what the tube is called should i get it welded back on or get a whole new metal tube assembly( whatever it is called you guys probably know) all i know is where the plastic hose attaches to the metal tube has broken off and the metal tube connects to the exhaust headers pics will be below