Front Heated Oxygen Sensor

Disconnect the negative battery terminal.
Disconnect the connector (A).

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