Subaru Impreza 2003 Service Manual page 704

FUEL INJECTION (FUEL SYSTEMS)
4. Engine Coolant Temperature
Sensor
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the air intake duct and air cleaner case.
<Ref. to IN(H4SO)-6, REMOVAL, Air Intake Duct.>
and <Ref. to IN(H4SO)-5, REMOVAL, Air Cleaner
Case.>
3) Disconnect the connector from engine coolant
temperature sensor.
4) Remove the engine coolant temperature sensor.
ENGINE COOLANT TEMPERATURE SENSOR
FU-00009
FU-00145
FU(H4SOw/oOBD)-28
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
18 N·m (1.8 kgf-m, 13.0 ft-lb)
FU-00288