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For a 1997 Mercury Mountaineer ( 5.0 liter V8 )

( there are a total of 4 oxygen sensors , 2 sensors that are used with the PCM to adjust the fuel ratio that are nearest the engine on both sides , and 2 sensors that are also called catalyst monitors because they are in the exhaust after the catalytic converters ( downstream sensors )

On the passenger side of the engine in a Mercury Mountaineer ( Bank 1 ) Sensor 1 ( upstream sensor ) and Sensor 2 ( downstream sensor )

On the drivers side ( Bank 2 )

Sensor 1 ( upstream sensor ) and Sensor 2 ( downstream sensor )

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Q: How many o2 sensors are on a 1997 mercury mountaineer?
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