O2 Sensors - All

This procedure covers the replacement of all four oxygen sensors (two upstream, two downstream) on the 2015-2020 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Upstream O2 sensor (Bank 1) × 1 — Motorcraft DY-1463 or equivalent
• Upstream O2 sensor (Bank 2) × 1 — Motorcraft DY-1463 or equivalent
• Downstream O2 sensor (Bank 1) × 1 — Motorcraft DY-1477 or equivalent
• Downstream O2 sensor (Bank 2) × 1 — Motorcraft DY-1477 or equivalent
• Anti-seize compound × 1 — Use nickel-based anti-seize

Preparation

1. Ensure engine and exhaust system are completely cold
2. Park vehicle on level surface and engage parking brake
3. Place wheel chocks behind rear wheels
4. If available, use OBD-II scanner to note which sensors are reporting faults
5. Raise front of vehicle with jack and support securely on jack stands
6. Spray all four O2 sensor threads with penetrating oil and allow to soak for 15-20 minutes if sensors are original or vehicle has high mileage

Procedure

1. 1

   Access upstream sensors
   From engine bay, locate the two upstream O2 sensors. Bank 1 (passenger side) sensor is located in the exhaust manifold or just after the manifold collector. Bank 2 (driver side) sensor is in the corresponding location on the driver side. Trace wiring harnesses to locate electrical connectors.
2. 2

   Disconnect upstream sensor connectors
   Press release tab on each upstream sensor electrical connector and disconnect. Bank 1 upstream connector is typically near the right fender area. Bank 2 upstream connector is near the master cylinder area. Do not pull on wires themselves.
   ⚠Connector release tabs may be brittle on higher mileage vehicles. Apply gentle pressure to avoid breaking.
3. 3

   Remove upstream O2 sensors
   Using the oxygen sensor socket and ratchet with extension, turn each upstream sensor counterclockwise to remove. Work from above the engine. If sensor is seized, apply additional penetrating oil and allow to soak, or carefully apply heat to the exhaust bung (not the sensor itself). Remove both upstream sensors.
   Torque spec

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

   Access downstream sensors
   From underneath the vehicle, locate the two downstream O2 sensors. These are positioned in the exhaust pipes after the catalytic converters, approximately mid-vehicle. Bank 1 (passenger side) and Bank 2 (driver side) sensors are visible from below.
5. 5

   Disconnect downstream sensor connectors
   Trace downstream sensor wiring to locate electrical connectors, typically secured to the transmission or frame. Press release tabs and disconnect both downstream sensor connectors. May need to release any wiring clips or ties securing the harness.
6. 6

   Remove downstream O2 sensors
   Using oxygen sensor socket and ratchet with extension, turn each downstream sensor counterclockwise to remove. These sensors typically have more clearance than upstream sensors. Remove both downstream sensors.
   Torque spec

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

   Clean sensor bungs
   Use wire brush to clean threads in all four exhaust bungs where sensors were installed. Remove any carbon buildup, rust, or old anti-seize. Ensure threads are clean and undamaged.
8. 8

   Prepare new sensors
   Apply a thin coat of nickel-based anti-seize compound to the threads of each new O2 sensor. Apply only to the threads—do not get anti-seize on the sensor tip, protective sleeve, or any part that will be exposed to exhaust gases.
   ⚠Contamination of sensor element with anti-seize will cause immediate sensor failure and false readings.
9. 9

   Install upstream sensors
   Thread new upstream sensors into exhaust bungs by hand to avoid cross-threading. Once hand-tight, use oxygen sensor socket and torque wrench to tighten to specification. Install Bank 1 and Bank 2 upstream sensors.
   Torque spec

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

    Install downstream sensors
    Thread new downstream sensors into exhaust bungs by hand. Once hand-tight, use oxygen sensor socket and torque wrench to tighten to specification. Install Bank 1 and Bank 2 downstream sensors.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)
11. 11

    Route and connect wiring
    Route each new sensor's wiring harness following the original path. Ensure wires are not touching hot exhaust components, moving parts, or sharp edges. Secure with any original clips or ties. Connect all four electrical connectors, ensuring they click fully into place.
12. 12

    Lower vehicle and verify installation
    Lower vehicle from jack stands. Visually verify all four sensors are tight and all electrical connections are secure. Check that no wiring is hanging loose or contacting exhaust.

Reassembly

1. Ensure all four O2 sensor electrical connectors are fully seated and locked
2. Verify all sensor wiring is properly routed and secured away from heat and moving components
3. Double-check that all sensors are torqued to specification

Verification

• Start engine and allow to idle. Listen for any exhaust leaks at sensor locations
• Verify no check engine light appears on instrument cluster
• If OBD-II scanner is available, clear any stored codes and verify all O2 sensors are reporting data (voltage cycling for upstream, steady voltage for downstream)
• Take vehicle for 10-15 minute test drive through varied driving conditions to allow PCM to complete O2 sensor readiness monitors
• Re-scan for codes after test drive to confirm no new faults have set

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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