Toyota 89467-04040 Air Fuel Ratio Oxygen Sensor

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1. Locate the upstream sensor (left sensor on the left exhaust manifold, right sensor on the right exhaust manifold). 2. Trace the electrical lead to the sensor electrical connector, depress the release tab, and disconnect it. 3. Unscrew the upstream sensor with a wrench (an oxygen sensor socket cannot be used due to space constraints). 4. Apply anti-seize compound to the threads of the sensor for future removal (most new sensors already have this applied). 5. Tighten the oxygen sensor to the specified torque. 6. Installation is the reverse of removal.