This procedure covers removal and replacement of the upstream (Bank 1 Sensor 1) oxygen sensor on the 2012-2017 Toyota Camry 2.5L I4 engine, located in the exhaust manifold before the catalytic converter.

Warnings

Tools required

Parts

• Upstream oxygen sensor (Bank 1 Sensor 1) × 1 — Toyota 89465-06060 or equivalent

Preparation

1. Ensure the engine and exhaust system are completely cool
2. Disconnect the negative battery terminal and wait 90 seconds to allow airbag system capacitors to discharge
3. Locate the upstream oxygen sensor on the exhaust manifold (passenger side, near firewall)
4. If better access is needed, remove the engine cover by pulling upward on the four retaining clips

Procedure

1. 1

   Disconnect oxygen sensor electrical connector
   Trace the oxygen sensor wire to locate the electrical connector. Press the release tab and carefully disconnect the connector from the sensor wiring harness. The connector is typically secured with a wire clip or bracket that may need to be released first.
2. 2

   Apply penetrating oil if needed
   If the vehicle has high mileage or the sensor has never been replaced, spray penetrating oil around the base of the oxygen sensor threads where it enters the exhaust manifold. Allow 10-15 minutes for penetration to reduce the risk of thread damage during removal.
3. 3

   Remove the upstream oxygen sensor
   Using a 22mm oxygen sensor socket and ratchet with extension, loosen the oxygen sensor by turning counterclockwise. The sensor socket has a cutout to allow the wire to pass through. Once loosened, unthread the sensor by hand and remove it from the exhaust manifold. Note the orientation and depth of installation.
4. 4

   Clean the oxygen sensor bung threads
   Use a wire brush to thoroughly clean the threads in the exhaust manifold oxygen sensor bung. Remove any carbon deposits, old anti-seize, or debris. Ensure the threads are clean and not damaged. If threads are damaged, the exhaust manifold may require repair or replacement.
5. 5

   Prepare the new oxygen sensor
   Remove the new oxygen sensor from its packaging. Apply a thin coating of anti-seize compound to the threads of the new sensor only. Do NOT allow anti-seize to contact the sensor tip or element. If the sensor comes pre-coated with anti-seize from the manufacturer, do not add additional compound.
6. 6

   Install the new oxygen sensor
   Carefully thread the new oxygen sensor into the exhaust manifold bung by hand, ensuring the wire routing matches the original sensor position. Thread the sensor in at least 3-4 full turns by hand to confirm proper thread engagement and prevent cross-threading.
   Torque spec

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

   Reconnect the electrical connector
   Route the oxygen sensor wire along the same path as the original sensor. Connect the electrical connector to the vehicle harness until it clicks into place. Secure any wire clips or brackets to prevent the wire from contacting hot exhaust components or moving engine parts.
8. 8

   Reinstall engine cover if removed
   If the engine cover was removed for access, align it with the four mounting points and press down firmly until all clips engage with an audible click.
9. 9

   Reconnect battery and clear codes
   Reconnect the negative battery terminal. Start the engine and allow it to idle. The check engine light should illuminate briefly during startup then extinguish. If a scan tool is available, clear any stored oxygen sensor fault codes.

Reassembly

1. Ensure the oxygen sensor wire is properly routed and secured away from heat sources and moving components
2. Verify the electrical connector is fully seated and the locking tab is engaged
3. Confirm no tools or parts were left in the engine bay

Verification

• Start the engine and verify no exhaust leaks are present at the oxygen sensor location (listen for hissing sounds)
• Allow the engine to reach operating temperature and verify the check engine light does not illuminate
• Use a scan tool to confirm the new oxygen sensor is providing voltage readings that fluctuate between 0.1-0.9 volts once in closed loop operation
• Take a test drive and verify smooth engine operation with no hesitation or poor fuel economy symptoms

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