To remove

Undo the exhaust manifold heat shield.

Fig 1: Illustration For Step 1-2
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Undo the screw securing the heat shield and sensor.
Detach the sensor and O-ring.

Fig 2: Illustration For Step 3-6
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Follow the sensor connecting cable and undo the clip on the water pipe.
Detach the connector from the holder.
Unplug the connector.
Change the sensor.