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To replace the HO2S (heated oxygen sensor) heater control circuit on a 2003 Infiniti G35, first, disconnect the negative battery terminal to ensure safety. Locate the oxygen sensor, which is typically found on the exhaust manifold or downstream in the exhaust system, and unplug the electrical connector. Remove the sensor using an appropriate socket or wrench, then install the new sensor and reconnect the electrical connector. Finally, reconnect the battery and clear any diagnostic trouble codes if necessary.

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