O2 Sensors - All

Complete replacement of all four oxygen sensors (two upstream, two downstream) on the 2011-2014 Ford F-150 5.0L Coyote V8 4WD exhaust system.

Warnings

Tools required

Parts

• Upstream O2 sensor (Bank 1, Sensor 1) × 1 — Motorcraft DY-1335 or equivalent
• Upstream O2 sensor (Bank 2, Sensor 1) × 1 — Motorcraft DY-1335 or equivalent
• Downstream O2 sensor (Bank 1, Sensor 2) × 1 — Motorcraft DY-1332 or equivalent
• Downstream O2 sensor (Bank 2, Sensor 2) × 1 — Motorcraft DY-1332 or equivalent

Preparation

1. Park vehicle on level surface and apply parking brake with wheels chocked
2. Allow exhaust system to cool completely (minimum 2 hours after engine operation)
3. Raise front of vehicle and secure on jack stands rated for vehicle weight
4. Disconnect negative battery terminal to clear adaptive memory
5. If available, clear any existing O2 sensor codes with OBD-II scanner and record baseline values
6. Spray all four O2 sensor threads with penetrating oil and allow to soak for 15-20 minutes

Procedure

1. 1

   Access Bank 1 Sensor 1 (passenger side upstream)
   From engine bay, locate the upstream O2 sensor on the passenger side exhaust manifold. Trace the wiring harness to the connector and disconnect it by pressing the release tab. The sensor is positioned in the exhaust manifold collector area before the catalytic converter.
2. 2

   Remove Bank 1 Sensor 1
   Using the 22mm oxygen sensor socket and ratchet, turn the sensor counterclockwise to remove. If sensor is seized, use a breaker bar for additional leverage. Work slowly to avoid breaking the sensor body. Clean the bung threads with a wire brush once sensor is removed.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
3. 3

   Install new Bank 1 Sensor 1
   Apply a thin coat of anti-seize compound to the threads of the new sensor only, avoiding the sensor tip and element completely. Thread sensor in by hand to prevent cross-threading, then torque to specification using the oxygen sensor socket. Reconnect the electrical connector ensuring it clicks securely.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
4. 4

   Access Bank 2 Sensor 1 (driver side upstream)
   From engine bay, locate the upstream O2 sensor on the driver side exhaust manifold. Disconnect the wiring harness connector. Access may be more restricted on driver side due to steering components.
5. 5

   Remove Bank 2 Sensor 1
   Using the 22mm oxygen sensor socket with extension, turn the sensor counterclockwise to remove. You may need to work from underneath the vehicle for better access. Clean the bung threads with a wire brush after removal.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
6. 6

   Install new Bank 2 Sensor 1
   Apply anti-seize to threads only, hand-thread the new sensor into place, then torque to specification. Reconnect the electrical connector ensuring proper seating and locking.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
7. 7

   Access Bank 1 Sensor 2 (passenger side downstream)
   Working from underneath the vehicle, locate the downstream O2 sensor on the passenger side exhaust pipe after the catalytic converter. Disconnect the wiring harness connector which may be clipped to the frame or body.
8. 8

   Remove Bank 1 Sensor 2
   Using the 22mm oxygen sensor socket, remove the downstream sensor by turning counterclockwise. These sensors are typically less seized than upstream sensors due to lower operating temperatures. Clean bung threads after removal.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
9. 9

   Install new Bank 1 Sensor 2
   Apply anti-seize to threads only, hand-start the sensor, then torque to specification. Route the wiring harness to avoid contact with hot exhaust components or moving parts. Reconnect the electrical connector and secure any harness clips.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
10. 10

    Access Bank 2 Sensor 2 (driver side downstream)
    From underneath the vehicle, locate the downstream O2 sensor on the driver side exhaust pipe after the catalytic converter. Disconnect the wiring harness connector.
11. 11

    Remove Bank 2 Sensor 2
    Remove the final downstream sensor using the 22mm oxygen sensor socket, turning counterclockwise. Clean the bung threads with a wire brush.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)
12. 12

    Install new Bank 2 Sensor 2
    Apply anti-seize to threads only, hand-start the sensor, then torque to specification. Ensure wiring harness is properly routed and secured, then reconnect the electrical connector. Verify all four O2 sensor connectors are properly seated and locked.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)

Reassembly

1. Double-check that all four O2 sensor electrical connectors are fully seated and locked
2. Verify all wiring harnesses are secured and clear of exhaust components and moving parts
3. Lower vehicle from jack stands safely
4. Reconnect negative battery terminal

Verification

• Start engine and verify no exhaust leaks at any O2 sensor location (listen for hissing)
• Allow engine to reach operating temperature and verify Check Engine Light does not illuminate
• Use OBD-II scanner to verify all four O2 sensors are reporting data and switching properly
• Perform a test drive including highway speeds to allow sensors to reach operating temperature
• Re-check for codes after test drive; adaptive fuel trim should begin normalizing within 50-100 miles of driving

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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