>> B << Heated Oxygen Sensor Installation
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
In the same manner as removal, use special tool oxygen sensor wrench (MB991953) to tighten the heated oxygen sensor to the specified torque.
Tightening torque: 44 ± 5 N.m (32 ± 3 ft-lb)
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.