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Heated Oxygen Sensor (Ho2S)

Vehicle may be equipped with one or 2 HO2S sensors. They are located in exhaust pipe, upstream of catalytic converters. Faults in sensor or circuit should set a service code. See QUICK TEST in TESTS W/CODES article in the ENGINE PERFORMANCE section. If no service code has been set, see CIRCUIT TEST H in TESTS W/CODES article for additional sensor specifications and circuit testing procedures. Ensure that none of following conditions exist:

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