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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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βˆ™ 2012-08-02 13:08:09
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Q: How many o2 sensors does a 1997 mercury mountaineer have?
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