Repair procedures: Removal

Remove the rear wheel and tire.
Tightening torque:

88.3 ~ 107.9 N.m (9.0 ~ 11.0 kgf.m, 65.1 ~ 79.6 lb-ft)
Remove the rear wheel speed sensor mounting bolt (A).
Tightening torque:

6.9 ~ 9.8 N.m (0.7 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

Fig 1: Locating Rear Wheel Speed Sensor Mounting Bolt
Courtesy of KIA MOTORS AMERICA, INC.
Remove the rear seat back.
(Refer to the Body - "REAR SEAT ASSEMBLY REPLACEMENT ")
Disconnect the rear wheel speed sensor connector.
Installation is the reverse of removal.
CAUTION: Install the rear sensor after lubricating the O-ring of sensor with the assembly fluid(RAREMAX AF-1).
When inserting the sensor, take care the O-ring not to be damaged.