This procedure covers the removal and replacement of the downstream (rear) oxygen sensor on the 2012-2017 Toyota Camry 2.5L I4 engine, located after the catalytic converter.

Warnings

Tools required

Parts

• Downstream O2 sensor (Bank 1 Sensor 2) × 1 — 89465-06050 or equivalent

Preparation

1. Allow engine and exhaust system to cool completely (minimum 2 hours after operation)
2. Park vehicle on level surface and apply parking brake
3. Place wheel chocks behind rear wheels
4. Raise front of vehicle and support securely on jack stands
5. Locate the downstream O2 sensor on the exhaust pipe approximately 18-24 inches after the catalytic converter on the driver's side

Procedure

1. 1

   Disconnect sensor electrical connector
   Trace the sensor wire from the exhaust pipe to the electrical connector. Press the tab on the connector and disconnect it from the vehicle harness. The connector is typically secured to a bracket near the transmission.
2. 2

   Free sensor wire from routing clips
   Remove the sensor wire from any routing clips or brackets along the exhaust pipe and chassis. Note the routing path for reinstallation.
3. 3

   Apply penetrating oil (if necessary)
   If the sensor has been in service for an extended period, spray penetrating oil around the base of the sensor where it threads into the exhaust pipe. Allow 10-15 minutes for penetration.
4. 4

   Remove downstream O2 sensor
   Using an O2 sensor socket or 22mm wrench, turn the sensor counterclockwise to remove it from the exhaust pipe. The sensor socket has a slot to allow the wire to pass through. Apply steady pressure and avoid forcing to prevent damaging the exhaust threads.
5. 5

   Inspect and clean threads
   Inspect the threads in the exhaust pipe bung for damage or excessive carbon buildup. Use a wire brush to clean the threads if necessary. Ensure threads are clean and undamaged before installing the new sensor.
6. 6

   Prepare new O2 sensor
   Apply a thin coat of anti-seize compound to the threads of the new O2 sensor. Apply only to the threads and avoid getting any anti-seize on the sensor tip or sensing element, as this will damage the sensor.
   Torque spec

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

   Install new downstream O2 sensor
   Thread the new sensor into the exhaust pipe by hand to ensure proper thread engagement. Once hand-tight, use the O2 sensor socket and torque wrench to tighten to specification.
   Torque spec

   O2 Sensor45 Nm (33 lb-ft)
8. 8

   Route sensor wire
   Route the sensor wire following the original path noted during removal. Secure the wire in all original routing clips and brackets to prevent contact with hot exhaust components or moving parts.
9. 9

   Connect electrical connector
   Connect the sensor electrical connector to the vehicle harness until it clicks into place. Ensure the connector is fully seated and the locking tab is engaged.
10. 10

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

Reassembly

1. Ensure sensor wire is properly routed and secured away from exhaust heat and moving components
2. Verify electrical connector is fully seated and locked

Verification

• Start the engine and verify no exhaust leaks at the O2 sensor location
• Allow engine to reach operating temperature and verify the check engine light does not illuminate
• Use an OBD-II scanner to verify sensor 2 is reading properly and no diagnostic trouble codes are present
• Verify sensor heater circuit is functioning (typically shows voltage activity within 30 seconds of startup)
• Road test vehicle and confirm no warning lights appear

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