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It's the sensor under the passenger seat near your Y pipe. (The IS has 4 sensors.....3 near the engine, and this one) Unscrew it (VERY hard to get off) then cut the wires. Splice the wires from a new one, solder, heat shring wrap it, disconnect battery to reset ecu, and you are good to go.

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16y ago
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Q: How do you change o2 sensor in a Lexus IS300 bank 2?
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