Front Heated Oxygen Sensor

Disconnect the battery negative (-) terminal.
Disconnect the front heated oxygen sensor connector (A)

Courtesy of KIA MOTORS AMERICA, INC.
Remove the front heated oxygen sensor (A) by using the SST (09392-1Y100 or 09392-2H100).
Tightening torque:

39.2 - 49.1 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.2 lb.ft)

Courtesy of KIA MOTORS AMERICA, INC.