This procedure covers the replacement of the upstream oxygen sensor (pre-catalytic converter) on the 2015-2020 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Upstream oxygen sensor (Bank 1 or Bank 2) × 1 — Use OEM Motorcraft DY-1308 or equivalent

Preparation

1. Ensure engine and exhaust system are completely cold to the touch
2. Determine which oxygen sensor requires replacement: Bank 1 (passenger side) or Bank 2 (driver side)
3. Park vehicle on level surface and engage parking brake
4. Place wheel chocks behind rear wheels
5. Raise front of vehicle with floor jack and support securely on jack stands at manufacturer frame points
6. Locate the upstream O2 sensor on the appropriate exhaust manifold or downpipe before the catalytic converter

Procedure

1. 1

   Disconnect oxygen sensor electrical connector
   Locate the wiring harness connector for the upstream O2 sensor. Press the locking tab and carefully pull the connector apart. The connector may be mounted to a bracket on the engine or frame rail. On some models, you may need to release a wire retaining clip from its bracket first.
2. 2

   Apply penetrating oil to sensor threads
   Spray penetrating oil around the base of the oxygen sensor where it threads into the exhaust manifold or downpipe. Allow 5-10 minutes for penetration. This helps prevent thread damage during removal, especially on higher-mileage vehicles.
3. 3

   Remove the upstream oxygen sensor
   Using the 22mm oxygen sensor socket and ratchet with extension, turn the sensor counterclockwise to remove. The sensor socket has a cutout to allow the wiring to pass through. If resistance is encountered, apply additional penetrating oil and allow more soak time. Do not force as this may damage exhaust threads.
4. 4

   Clean sensor bung threads
   Once the old sensor is removed, use a wire brush to clean the threads in the exhaust manifold or downpipe bung. Remove all carbon deposits and old anti-seize compound to ensure proper seating and torque reading for the new sensor.
5. 5

   Prepare new oxygen sensor
   Remove the new oxygen sensor from its protective packaging. Apply a thin coat of anti-seize compound to the threads only, being extremely careful not to get any on the sensor tip or perforated protective sleeve. Contamination of the sensing element will cause immediate failure.
6. 6

   Install new oxygen sensor
   Thread the new sensor into the exhaust bung by hand until finger-tight. Ensure the wiring harness routes correctly and is not kinked or stretched. Use the oxygen sensor socket and torque wrench to tighten to specification.
   Torque spec

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

   Reconnect electrical connector
   Route the oxygen sensor wiring harness to avoid contact with hot exhaust components or moving parts. Reconnect the electrical connector until it clicks into place. If equipped, secure the wiring to any retaining clips or brackets along the frame rail or engine.
8. 8

   Lower vehicle
   Remove jack stands and carefully lower the vehicle to the ground. Remove wheel chocks.

Reassembly

1. Verify oxygen sensor wiring is properly routed away from exhaust heat and moving components
2. Ensure electrical connector is fully seated and locked
3. Double-check that no tools or parts were left in the engine bay

Verification

• Start the engine and verify no exhaust leaks are present at the oxygen sensor location
• Allow the engine to reach operating temperature and confirm the check engine light does not illuminate
• Use an OBD-II scanner to verify the new oxygen sensor is providing voltage readings (typically 0.1-0.9V fluctuating when warm)
• Clear any diagnostic trouble codes that were stored from the faulty sensor
• Perform a test drive and verify proper engine operation with no driveability issues

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