This procedure covers the replacement of a universal catalytic converter on a 2012-2017 Toyota Camry with the 2.5L I4 engine, including removal of the OEM converter and installation of a weld-in or bolt-in universal replacement.

Warnings

Tools required

Parts

• Universal catalytic converter (2.25" inlet/outlet) × 1 — Match OEM diameter and length specifications
• Exhaust flange gasket (front) × 1 — Use OEM specification
• Exhaust flange gasket (rear) × 1 — Use OEM specification
• Exhaust flange bolts and nuts × 6 — M10 hardware
• Oxygen sensor (upstream) × 1 — OEM or direct-fit replacement
• Oxygen sensor (downstream) × 1 — OEM or direct-fit replacement

Preparation

1. Park vehicle on level surface and engage parking brake. Place wheel chocks behind rear wheels.
2. Allow exhaust system to cool completely for at least 45 minutes after last engine operation.
3. Raise front of vehicle and support securely on jack stands at manufacturer-specified lift points.
4. Spray all exhaust flange bolts, oxygen sensor threads, and heat shield bolts with penetrating oil. Allow 15-20 minutes to soak.
5. If vehicle has belly pan or skid plate, remove retaining bolts to access exhaust system.

Procedure

1. 1

   Remove heat shields
   Locate the heat shields covering the catalytic converter and front exhaust pipe. Remove all heat shield mounting bolts using a 10mm socket. Some shields may have multiple sections. Remove shields and set aside for reinstallation.
   Torque spec

   Heat Shield Bolts10 Nm (7 lb-ft)
2. 2

   Disconnect upstream oxygen sensor
   Locate the upstream (pre-cat) oxygen sensor in the exhaust manifold or front pipe. Disconnect the electrical connector by pressing the release tab. Using a 22mm oxygen sensor socket, carefully turn counterclockwise to remove sensor. If sensor is severely corroded or will not be reused, it may be cut off.
   ⚠Do not force oxygen sensor. If frozen, apply additional penetrating oil and heat with propane torch if necessary. Protect wiring harness from heat.
   Torque spec

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

   Disconnect downstream oxygen sensor
   Locate the downstream (post-cat) oxygen sensor on the catalytic converter body or rear pipe. Disconnect electrical connector and remove sensor using oxygen sensor socket. Keep track of sensor position if reusing.
   Torque spec

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

   Disconnect front exhaust flange
   Locate the front exhaust flange connection between the exhaust manifold and front pipe. Remove the two flange bolts and nuts using a 14mm socket and wrench. Support the exhaust pipe with one hand to prevent it from dropping. Separate the flange connection and remove the old gasket.
   Torque spec

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

   Disconnect rear exhaust flange
   Locate the rear flange connection between the catalytic converter outlet and center exhaust pipe. Remove flange bolts and nuts. Support the center pipe section or use exhaust hanger removal tool to detach rubber hangers as needed. Separate flange and remove old gasket.
   Torque spec

   Exhaust Flange Bolts45 Nm (33 lb-ft)
6. 6

   Remove OEM catalytic converter assembly
   With both flanges disconnected, detach any remaining exhaust hangers supporting the converter section. Carefully lower the OEM catalytic converter assembly from the vehicle. Inspect the front and rear pipe sections for damage or excessive corrosion.
7. 7

   Prepare pipes for universal converter
   Measure the OEM converter to determine proper placement of universal converter. Mark cut lines on the front and rear pipes where the universal converter will be installed. Using a reciprocating saw or pipe cutter, cut the exhaust pipes at marked locations. Ensure cuts are straight and perpendicular to pipe axis. Deburr cut edges with file or grinder.
   ⚠Measure twice and cut once. Incorrect pipe cuts cannot be easily corrected and may require additional pipe sections.
8. 8

   Install oxygen sensor bungs if needed
   If the universal converter does not include pre-welded oxygen sensor bungs, weld bungs to the converter body in the appropriate locations (upstream and downstream). Ensure bungs are oriented for proper sensor access and clearance. Allow welds to cool completely.
9. 9

   Test fit universal converter
   Position the universal converter between the cut pipe ends. Verify proper alignment with exhaust hangers and adequate clearance from chassis, driveshaft, and heat-sensitive components. Make any necessary adjustments to pipe positioning before final installation.
10. 10

    Install universal converter
    For weld-in converter: Tack weld the converter inlet and outlet to the cut pipe ends, verify alignment, then complete full circumference welds. For band-clamp converter: Slide band clamps onto pipes, position converter, and tighten clamps evenly to manufacturer specifications. Ensure all joints are sealed and properly aligned.
    ⚠️When welding, disconnect battery negative terminal and protect fuel lines, brake lines, and wiring from sparks and heat. Have fire extinguisher nearby.
11. 11

    Reconnect front exhaust flange
    If using flange-style universal converter or retaining front flange connection, install new exhaust gasket at front flange. Apply anti-seize compound to flange bolt threads. Insert bolts and hand-tighten nuts. Torque flange bolts in a crisscross pattern to specification.
    Torque spec

    Exhaust Flange Bolts45 Nm (33 lb-ft)
12. 12

    Reconnect rear exhaust flange
    Install new gasket at rear flange connection. Apply anti-seize to bolt threads. Insert bolts and hand-tighten nuts. Torque in crisscross pattern to specification. Reattach exhaust hangers to rubber mounts, ensuring system is properly supported.
    Torque spec

    Exhaust Flange Bolts45 Nm (33 lb-ft)
13. 13

    Install oxygen sensors
    Apply a thin coat of anti-seize compound to oxygen sensor threads only (avoid getting anti-seize on sensor tip). Thread upstream oxygen sensor into bung by hand until snug. Torque to specification using oxygen sensor socket. Repeat for downstream sensor. Reconnect both electrical connectors ensuring they click securely.
    ⚠Never apply anti-seize to oxygen sensor tip or allow contamination of sensing element. This will cause permanent sensor failure.
    Torque spec

    O2 Sensor45 Nm (33 lb-ft)
14. 14

    Reinstall heat shields
    Position heat shields over catalytic converter and exhaust pipes. Install mounting bolts and torque to specification. Ensure shields do not contact exhaust pipes directly and have proper clearance.
    Torque spec

    Heat Shield Bolts10 Nm (7 lb-ft)

Reassembly

1. Verify all exhaust connections are tight and properly torqued.
2. Ensure oxygen sensor wiring is routed away from hot exhaust components and secured with original clips.
3. Reinstall belly pan or skid plate if equipped.
4. Lower vehicle from jack stands and remove wheel chocks.

Verification

• Start engine and listen for exhaust leaks at all connection points. A hissing sound indicates a leak requiring immediate attention.
• Allow engine to reach operating temperature and verify no unusual odors or smoke from exhaust system.
• Use OBD-II scanner to clear any stored catalytic converter codes. Drive vehicle through several drive cycles to verify oxygen sensors are functioning properly.
• Check for proper ground clearance and verify exhaust system does not contact chassis or suspension components during test drive.
• Re-check all flange bolts and band clamps after 50-100 miles of driving to ensure they remain tight.

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