To remove

Unplug the oxygen sensor and carefully lower the cable.

Fig 1: Illustration For Steps 1-2
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Remove the heat shield over the turbocharger (note the clip underneath the heat shield, see TURBOCHARGER SYSTEM, 4-CYLINDER .
Remove the oxygen sensor.

Fig 2: Identifying Oxygen Sensor
Courtesy of SAAB-SCANIA OF AMERICA, INC.