This procedure covers the replacement of the exhaust flex pipe on a 2018-2024 Toyota Camry with the 2.5L I4 engine, including removal of heat shields and oxygen sensors.

Warnings

Tools required

Parts

• Exhaust flex pipe assembly × 1 — Use OEM specification or equivalent meeting Toyota standards
• Exhaust flange gasket × 2 — Use OEM specification
• Flange bolts/nuts × 6 — M10 x 1.25mm stainless steel
• Exhaust clamp × 1 — Use OEM specification if clamp-style connection

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. Raise front of vehicle and support securely on jack stands at manufacturer-specified lift points
5. Spray all exhaust fasteners with penetrating oil and allow to soak for 15-30 minutes
6. Locate the flex pipe assembly between the catalytic converter and exhaust manifold

Procedure

1. 1

   Remove heat shields
   Remove the heat shields covering the flex pipe area. These are typically secured with 10mm bolts. Remove all accessible heat shield bolts and carefully lower shields away from work area. Some shields may have multiple sections.
   Torque spec

   Heat Shield Bolts14 Nm (10 lb-ft)
2. 2

   Disconnect upstream oxygen sensor
   Locate the upstream oxygen sensor on or near the flex pipe assembly. Disconnect the electrical connector by pressing the release tab. Using a 22mm oxygen sensor socket, carefully unthread the sensor counterclockwise. If sensor is difficult to remove, apply additional penetrating oil and allow to soak. Store sensor in a safe location with threads pointing upward to protect the tip.
   ⚠Do not force oxygen sensor. Threads are easily damaged. Use proper oxygen sensor socket with wire cutout.
   Torque spec

   O2 Sensor47 Nm (35 lb-ft)
3. 3

   Remove exhaust hangers
   Locate the rubber exhaust hangers supporting the exhaust system near the flex pipe. Remove hanger bolts using 12mm socket. You may need to support the exhaust pipe weight with a jack or stand as you remove hangers.
   Torque spec

   Hanger Bolts20 Nm (15 lb-ft)
4. 4

   Disconnect front flange connection
   Locate the front flange connection between the exhaust manifold and flex pipe. Remove the flange nuts/bolts using 14mm socket. There are typically 3 bolts at this connection. Remove and discard old exhaust gasket. Clean flange surfaces with wire brush.
   ⚠Fasteners may be severely corroded. Use six-point sockets to prevent rounding. Have replacement fasteners available if originals are damaged.
   Torque spec

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

   Disconnect rear connection
   Disconnect the rear connection of the flex pipe to the downstream exhaust pipe. This may be a flange connection with bolts or a clamp-style connection. If flange-type, remove bolts and gasket. If clamp-type, loosen clamp bolts and slide clamp back. Support the downstream exhaust pipe to prevent it from dropping.
   Torque spec

   Flange Bolts45 Nm (33 lb-ft)

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

   Remove flex pipe assembly
   With all connections disconnected, carefully maneuver the flex pipe assembly out from under the vehicle. You may need to rotate or angle the pipe to clear surrounding components. Inspect mounting points and hangers for damage while assembly is removed.
   ℹ️Flex pipe may be heavier than expected due to catalytic converter proximity. Use proper lifting technique.
7. 7

   Clean mounting surfaces
   Thoroughly clean all flange mating surfaces using a wire brush and scraper. Remove all old gasket material, carbon deposits, and corrosion. Clean oxygen sensor mounting hole threads with a thread chaser or tap if available. Inspect flanges for cracks or warping.
   ⚠Ensure all old gasket material is removed. Poor sealing will cause exhaust leaks.
8. 8

   Install new flex pipe assembly
   Position new flex pipe assembly under vehicle. Install new exhaust gaskets on front and rear flanges. Loosely install all flange bolts hand-tight before final torquing. Ensure flex pipe is properly oriented with adequate clearance from surrounding components, hoses, and wiring.
   ℹ️Do not fully tighten any fasteners until all connections are started. This allows for alignment adjustment.
9. 9

   Torque flange connections
   Torque front flange bolts to specification in a crisscross pattern to ensure even gasket compression. Then torque rear connection (flange bolts or clamp bolts) to specification. Verify all connections are secure and properly aligned.
   Torque spec

   Flange Bolts45 Nm (33 lb-ft)

   Exhaust Clamps55 Nm (41 lb-ft)
10. 10

    Reinstall exhaust hangers
    Reconnect exhaust hangers and torque hanger bolts to specification. Ensure exhaust system hangs evenly with proper clearance from underbody components. Adjust hanger positions if necessary before final torquing.
    Torque spec

    Hanger Bolts20 Nm (15 lb-ft)
11. 11

    Install oxygen sensor
    Apply a thin coat of anti-seize compound to the oxygen sensor threads, being careful not to contaminate the sensor tip. Thread sensor into mounting hole by hand until snug. Torque sensor to specification using 22mm oxygen sensor socket. Reconnect electrical connector ensuring it clicks securely.
    ⚠Do not apply anti-seize to sensor tip or allow contamination. Use only on threads.
    Torque spec

    O2 Sensor47 Nm (35 lb-ft)
12. 12

    Reinstall heat shields
    Reinstall all heat shields in reverse order of removal. Ensure shields are properly positioned and not contacting the flex pipe or creating rattles. Torque heat shield bolts to specification.
    Torque spec

    Heat Shield Bolts14 Nm (10 lb-ft)

Reassembly

1. Visually inspect all connections for proper alignment and clearance
2. Verify no tools or parts were left in the work area
3. Lower vehicle from jack stands carefully
4. Remove wheel chocks

Verification

• Start engine and allow to idle. Listen for exhaust leaks at all connection points
• With engine at idle, carefully feel around connections for escaping exhaust gases (do not touch hot components)
• Check for any unusual vibrations or rattling noises from exhaust system
• Verify no warning lights are illuminated on dashboard (check engine light for O2 sensor)
• Take vehicle for test drive and verify no exhaust drone, vibration, or smell in cabin
• After test drive, re-inspect all connections while exhaust is hot for any signs of leaks or loosening
• Scan for diagnostic codes to ensure oxygen sensor is functioning properly

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