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O2 Sensor

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Old 12-28-2007, 11:50 PM
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O2 Sensor

Hello I have a 97 Ford Expedition 5.4L. My check engine light is on and I'm getting a PO 161 code which I look up(O2 sensor heater circuit malfunction bank 2 sensor 2. My question is were is this sensor located. I understand I have 4 O2 sensors.
 
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Old 12-29-2007, 07:52 AM
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Downstream (furthest from the engine) on the driver's side.

Steve
 
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Old 12-29-2007, 05:07 PM
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Replaced it today, that fixed the problem, thanks Steve.
 
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Old 12-30-2007, 08:21 AM
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It sometimes takes days or weeks to run the internal test that makes the needed check to determine if the sensors and heaters are working correctly.

Just a heads-up so you don't get too optimistic too early.

Steve
 
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