Removal and Installation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

LH Heated Oxygen Sensor (HO2S)

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to JACKING & LIFTING .
Remove the 7 bolts (5 shown in illustration) and the LH splash shield.
- To install, tighten to 10 Nm (89 lb-in).
  
  Fig 1: Locating LH Splash Shield Bolts
  Courtesy of FORD MOTOR CO.
Disconnect the LH Heated Oxygen Sensor (HO2S) electrical connector.

NOTE: If necessary, lubricate the sensor threads with penetrating and lock lubricant to assist in removal.

Using the Exhaust Gas Oxygen Sensor Socket, remove the LH HO2S .
- Calculate the correct torque wrench setting for the following torque. Refer to the Torque Wrench Adapter Formulas in the illustration.
  
  Fig 2: Identifying Torque Wrench Adapter Formulas
  Courtesy of FORD MOTOR CO.
- To install, tighten to 48 Nm (35 lb-ft).
  
  Fig 3: Identifying Exhaust Gas Oxygen Sensor Socket
  Courtesy of FORD MOTOR CO.
RH HO2S
Disconnect the RH HO2S electrical connector.

NOTE: If necessary, lubricate the sensor threads with penetrating and lock lubricant to assist in removal.

Using the Exhaust Gas Oxygen Sensor Socket, remove the RH HO2S .
- Calculate the correct torque wrench setting for the following torque. Refer to the Torque Wrench Adapter Formulas in the illustration.
  
  Fig 4: Identifying Torque Wrench Adapter Formulas
  Courtesy of FORD MOTOR CO.
- To install, tighten to 48 Nm (35 lb-ft).
  
  Fig 5: Identifying Exhaust Gas Oxygen Sensor Socket
  Courtesy of FORD MOTOR CO.
All HO2S

NOTE: Apply a light coat of anti-seize lubricant to the threads of the HO2S .

To install, reverse the removal procedure.