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On a Lexus IS300, the O2 sensor signal can typically be found in the engine bay, connected to the exhaust system. The upstream O2 sensor is located in the exhaust manifold or just after it, while the downstream sensor is located after the catalytic converter. You can access the wiring harness connector for the O2 sensors by following the exhaust pipes and locating the sensors. For precise identification, consulting the vehicle's service manual is recommended.

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