Bank 1 is the passenger side of the engine in your Mercury Mountaineer
Sensor 1 would be close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
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 )
The first model year of the Mercury Mountaineer was 1997
The oxygen sensor for bank 1 sensor 1 for a 2000 mercury mountaineer is on the cylinder #1 side.
Bank 2 is the drivers side of the engine in a 2002 Mercury Mountaineer Sensor 2 is after the catalytic converter ( downstream )
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The oxygen sensors are in the exhaust pipes on most models.
Bank 1 is the passenger side of the engine in a Mercury Mountaineer ( V6 + V8 ) Sensor 2 is after the catalytic converter ( downstream )
Bank 2 is the drivers side of the engine in your Mercury Mountaineer ( V6 + V8 ) Sensor 1 is in the exhaust close to the engine before the exhaust enters the catalytic converter
Most oxygen sensors are heated oxygen sensors.
O2 sensors are always located on the exhaust system.
left side of the engine after the cat