Bank 1 (cyl. 1-3-5 passenger side) Sensor 1 (first sensor from engine) is accessible from under car. It is located just before the catalytic converter.
02 oxygen sensor circuit malfuction bank 1 sensor 1
Just in front of the Cat converter, drivers side.
Facing the car it is on the passenger side under the car after the cataylic converter
Try to picture this Bank 1 Sensor 1 Bank 2 Sensor 1 Catalytic Conv. Catalytic Conv. Bank 1 Sensor 2 Bank 2 Sensor 2
On exhaust, in front of each cat. convertor
The oxygen sensor for bank 1 sensor 1 for a 2000 mercury mountaineer is on the cylinder #1 side.
The HO2S (Heated Oxygen Sensor) bank 1 is between the manifolds and the Cadillac Converter. Manifold Exhaust (T) > "HO2S Sensor" > Cadillac Converter > muffler
o2 sensor is on driver side 2nd one back
bank 1 sensor 2 is after the cat
Bank 1 sensor 2 would be the sensor after the behind the catalytic converter.
Trouble code P0140means:O2 sensor ciruit-no activity detected (bank 1 sensor 2)
bank 2 sensor 2 location