Heated Oxygen Sensor (HO2S): Installation

WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

To install, reverse the removal procedure.
Apply anti-seize to thread of sensor, using special tool install the HO2S. Use Special Service Tool: 303-476 (T94P-9472-A) Socket, Exhaust Gas Oxygen Sensor.
Material: Motorcraft® High Temperature Nickel Anti-Seize Lubricant / XL-2

Torque: 35 lb.ft (48 Nm)

Courtesy of FORD MOTOR COMPANY
1. NOTE: Lubricating the grommets with silicone grease will aid in the installation of the engine appearance cover, and any future removal and installation of the cover.
  
  Lubricate each grommet with silicone grease.
  
  Material: Motorcraft® Silicone Brake Caliper Grease and Dielectric Compound / XG-3-A (ESE-M1C171-A)
2. Position the engine appearance cover onto engine with the grommets aligned with the studs.
3. Press down on the engine appearance cover at each grommet location to attach the grommets onto the studs.

Courtesy of FORD MOTOR COMPANY