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Heated Oxygen Sensor (HO2S)

WARNING: This page is about a different car, the 1996 Mercury Villager and 1995 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

Sensor is located in exhaust pipe, upstream of catalytic converter. Faults in sensor or circuit should set a service code. See QUICK TEST in TESTS W/CODES article. If no service code has been set, see CIRCUIT TEST HO2S in TESTS W/CODES article for additional sensor specifications and circuit testing procedures. Ensure that none of the following conditions exist:

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