YOU WILL NEED A 02 SENSOR SOCKET FOR THIS. DISCONNECT THE WIRES THAT GO TO THEM. SHOULD BE A DISCONNECT ON THEM. SPRAY SOME GOOD PENTRATING FLUID ON THEM LET SIT FOR 10-15 MINUTES AND DO IT AGAIN. TAKE A WRATCH AND START TO LOSSEN THEM GO SLOWLEY. WHEN THEY ARE OUT PUT SOME LIGHT OIL ON THE NEW ONE AND TIGHTEN THEM UP. THEY ARE NOT TO EASY TO GET TO, SO YOU MIGHT WANT A MECHANIC TO DO IT FOR YOU.
There are a total of ( 4 oxygen sensors ) according to the engine wiring schematic for the 1997 Mercury Mountaineer in my Haynes repair manual ( 2 oxygen sensors are " upstream " sensors used by the PCM to adjust the air / fuel ratio of the engine ) ( 2 oxygen sensors are " downstream " sensors / catalyst monitors )
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