This procedure covers the removal and replacement of the exhaust resonator on a 2011-2014 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Resonator assembly × 1 — Use OEM Ford or equivalent aftermarket resonator for 5.0L F-150
• Exhaust flange gasket × 2 — Use OEM specification
• Rubber exhaust hangers (if deteriorated) × 2 — Use OEM specification

Preparation

1. Park vehicle on level ground and apply parking brake
2. Place wheel chocks behind rear wheels
3. Allow exhaust system to cool completely (minimum 2 hours after engine operation)
4. Raise vehicle using floor jack and support securely on jack stands at manufacturer-specified lift points
5. Spray all exhaust fasteners with penetrating oil and allow 15-20 minutes soak time
6. Verify adequate clearance and lighting to access resonator assembly beneath vehicle

Procedure

1. 1

   Locate and inspect resonator assembly
   Position yourself under the vehicle with adequate lighting. The resonator is located in the mid-section of the exhaust system, between the H-pipe/catalytic converters (forward) and the muffler (rearward). Identify the connection points: forward flange connection to the H-pipe, rearward flange or clamp connection to the tailpipe/muffler assembly, and rubber hangers supporting the resonator. Note the position of any oxygen sensors in this section.
2. 2

   Disconnect downstream oxygen sensor (if equipped in this section)
   Locate the downstream oxygen sensor on or near the resonator. Disconnect the electrical connector by pressing the release tab and pulling apart. Using a 22mm oxygen sensor socket, carefully loosen the sensor by turning counterclockwise. Remove the sensor completely and set aside in a clean area. If sensor will be reused, inspect threads and apply anti-seize to threads before reinstallation.
   ⚠Oxygen sensors have fragile wiring. Do not pull on wires, only on the connector body. Sensor threads are precision-cut; cross-threading will damage both sensor and bung.
   Torque spec

   O2 Sensor59 Nm (44 lb-ft)
3. 3

   Support resonator assembly
   Position a jack stand or have an assistant support the resonator from below to prevent it from dropping when disconnected. The resonator assembly weighs approximately 15-25 pounds and is awkward to handle in the confined space.
4. 4

   Remove forward flange connection
   Locate the forward flange bolts connecting the resonator to the H-pipe or intermediate pipe. There are typically 2 bolts securing this connection. Using a 13mm socket, remove both flange bolts completely. Carefully separate the flange connection. Remove and discard the old flange gasket.
   ⚠If bolts are severely corroded and break, you may need to drill out studs or use a stud extractor. Consider using heat if penetrating oil is insufficient.
   Torque spec

   Flange Bolts45 Nm (33 lb-ft)
5. 5

   Remove rearward connection
   Identify the rear connection type (flange or clamp). If flange-type: remove the 2 flange bolts using a 13mm socket and separate the connection, discarding the old gasket. If clamp-type: loosen the exhaust clamp bolts using a 19mm socket until the clamp can be removed or pushed aside to allow separation of the pipes.
   Torque spec

   Flange Bolts45 Nm (33 lb-ft)

   Exhaust Clamps55 Nm (41 lb-ft)
6. 6

   Release rubber exhaust hangers
   Locate the rubber exhaust hangers supporting the resonator (typically 2 hangers). Using a pry bar or exhaust hanger removal tool, carefully work the metal hanger loops out of the rubber isolators. Apply steady pressure and use a twisting motion to release. Spray with soapy water if needed to ease removal.
7. 7

   Remove resonator assembly
   With all connections and hangers released, carefully lower the resonator assembly and remove it from under the vehicle. Inspect the rubber hangers for cracking, tearing, or deterioration and replace if necessary.
8. 8

   Prepare mounting surfaces
   Clean all flange surfaces using a wire brush to remove carbon deposits, old gasket material, and corrosion. Ensure mating surfaces are flat and free of debris. Inspect flange faces for warping or damage. Clean oxygen sensor bung threads with a wire brush or thread chaser if sensor will be reinstalled.
9. 9

   Install new resonator assembly
   Position the new resonator assembly beneath the vehicle. Install new flange gaskets on both forward and rearward connections. Align the resonator into position and insert the metal hanger loops into the rubber isolators. You may need an assistant to support the resonator while aligning all connection points simultaneously.
10. 10

    Connect forward flange
    Align the forward flange connection with new gasket in place. Start both flange bolts by hand to ensure proper thread engagement. Once both bolts are hand-tight, torque the flange bolts to specification in a cross-pattern to ensure even gasket compression.
    Torque spec

    Flange Bolts45 Nm (33 lb-ft)
11. 11

    Connect rearward flange or clamp
    Align the rearward connection with new gasket in place (if flange-type). For flange connection: install both bolts hand-tight, then torque to specification in cross-pattern. For clamp connection: position the clamp over the joint, install clamp bolts, and torque to specification ensuring pipes are fully seated together before final tightening.
    Torque spec

    Flange Bolts45 Nm (33 lb-ft)

    Exhaust Clamps55 Nm (41 lb-ft)
12. 12

    Reinstall oxygen sensor
    Apply a thin coat of anti-seize compound to the oxygen sensor threads (avoid getting anti-seize on the sensor tip). Thread the sensor into the bung by hand, ensuring it threads smoothly without resistance. Using the oxygen sensor socket, tighten to the specified torque. Reconnect the electrical connector ensuring it clicks into place securely.
    ⚠Use only a small amount of anti-seize on sensor threads. Excess can contaminate the sensor element. Never over-torque oxygen sensors as this can damage the threads in the bung.
    Torque spec

    O2 Sensor59 Nm (44 lb-ft)
13. 13

    Verify alignment and clearances
    Inspect the entire exhaust system to ensure proper alignment. Verify the resonator and all pipes have adequate clearance from the frame, driveshaft, fuel lines, and heat shields. There should be no contact points. Adjust hanger positions if necessary to achieve proper clearance and alignment.

Reassembly

1. Double-check all flange bolts and clamps are torqued to specification
2. Ensure oxygen sensor electrical connector is securely engaged and wiring is routed away from hot exhaust components
3. Verify all exhaust hangers are properly seated in rubber isolators
4. Confirm no tools or parts have been left under the vehicle

Verification

• Lower vehicle from jack stands and remove wheel chocks
• Start engine and listen for exhaust leaks at both flange connections and oxygen sensor bung
• Allow engine to reach operating temperature and perform a visual inspection underneath for any signs of exhaust gas leakage
• Test drive vehicle and monitor for any exhaust noise, vibration, or check engine light related to oxygen sensor operation
• After first 50-100 miles, re-inspect all exhaust connections for loosening and re-torque if necessary

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