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- 1997-2006 Expedition & Navigator (https://www.ford-trucks.com/forums/forum27/)

- - O2 Sensor (https://www.ford-trucks.com/forums/689193-o2-sensor.html)

madsonp

12-28-2007 11:50 PM

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.

projectSHO89

12-29-2007 07:52 AM

Downstream (furthest from the engine) on the driver's side.

Steve

madsonp

12-29-2007 05:07 PM

Replaced it today, that fixed the problem, thanks Steve.

projectSHO89

12-30-2007 08:21 AM

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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