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Ford Explorer is equipped with two oxygen sensor positioned on the exhaust manifold. Its necessary to replace the oxygen sensor at the first sign of failure. You can get all necessary details about o2 sensor at http://www.wholesalesensors.com/ford-oxygen-sensor/
Ford Explorer and V8 O2 Sensor Locations diagram. This shows the
location of Ford oxygen sensors on Bank 1 and Bank 2. If you want to
know where your O2 sensors are, this diagram is your guide (click over pic for zoom)...
Hope helps with this (remember to rate and comment this answer).
I ASSUME you mean the rear oxygen sensor???? 1 red wire is the o2 signal, the other is the o2 heater ground. the Orange is heater power The red wire in cavity 3 is the heater ground (terminal 20 at ECM). . the #1 cavity is BLACK, #2 RED, #3 RED #4 ORANGE looking at the connector its hard to tell you over print, but #1 is upper right, 2 upper left, 3 lower right, 4 lower left.
Hello! There are four O2's...Each O2 heater, left and right bank, front and rear, has it's own wire colors...These colors are "at the connector"...First series are the control ground sent by the PCM.. RR=White/Black...RF=Red/White...LR=Tan/Yellow...And LF=Yellow/Light Blue...........This series are the battery leads, hot when fuel pump relay pulls...RR=Violet/White... RF=Red/Yellow...LR=Violet/White...LF=Red/Yellow...
If you have any questions feel free to ask...Guru...Saailer