There are three O2 Sensors on my 1999 Cougar. Two are located just before the Y-Pipe and are both wired to the drivers side of the Y-Pipe. The other is located just after the Catalyic Converter.
Easy to change.
There are two oxygen sensors. One upstream and one downstream. The up stream is located at the front of the vehicle below the radiator and the other is near the cadillac converter. If u go to o reilleys they have a tool just for removing the sensors otherwise u could use a plyers or a cressent wrench to remove them
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 )
There are 2 oxygen sensors one upstream and one down stream. Both oxygen sensors are located underneath the van. The down stream oxygen sensor is located behind the cataylic converter near the cross pipe and the upstream oxygen sensor is located in front of the cataylic converter in plain sight. They look like spark plugs with either 8", 12", or 14" wires attached to them. The upstream oxygen sensors is easily located underneath the vechicle to the front. The downstream oxygen sensor is not the one lcoated on or close to the cataylic converter.
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