- 1). Locate the oxygen sensor you wish to replace. You'll find these four sensors just ahead of and just behind each of the two catalytic converters. They will resemble golden or brass pegs with wires coming out of the tips.
- 2). Unplug the sensor's wires from where they connect to the Tundra's electrical system. Be careful disconnecting the wires, as you do not want to damage the electrical connector or socket.
- 3). Use a wrench or ratchet and socket to unscrew the oxygen sensor from its mounting in your exhaust manifold. This may require some extra effort if the sensor has not been replaced for a long time; the heat and exhaust can sometimes cause the sensor to freeze in place. Safely discard the old O2 sensor.
- 4). Spray the threads of the new O2 sensor with WD-40 or a similar lubricating substance. Apply the same lubrication to the threads of the hole where you removed the old O2 sensor.
- 5). Screw the new O2 sensor back into the O2 sensor hole and tighten it down securely. Connect the trailing wires back to the electrical socket you removed your old O2 sensor's wires from.
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