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A technical document that provides detailed diagnostic and troubleshooting procedures for the heated oxygen sensor (3rd circuit) in vehicles designed for California. It includes wiring diagrams, schematics, and illustrations showing the connections and components involved in the system. The document outlines circuit operations, monitor execution, and diagnostic steps to assess and rectify the sensor's slow response. It also describes conditions under which diagnostic trouble code (DTC) P0145 is set, offering a flowchart for logic conditions and troubleshooting advice. The document also guides on using specific tools for diagnosis and testing procedures.