[Front Heated Oxygen Sensor]

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

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

49.0-63.7 N.m (5.0-6.5 kgf.m, 11.0 -14.3 lb.ft)

Courtesy of KIA MOTORS AMERICA, INC.