Jaguar X Type

Standing facing the Flywheel end of the engine, Bank 1 is located on the Right hand side of the engine, there are two sensors one upstream, on the engine side of the catalytic converter, and one down stream on the exhaust side of the catalytic converter.
Bank 1 Sensor 1 is the Upstream sensor for this side of the engine.

2.0L V6

Bank 1 sensor 1 is very difficult to access this sensor from under the vehicle, so the following description is based on accessing the sensor form above with the Inlet manifold removed, If your vehicle has in excess of 60K changing the spark plugs is also recomended to be done at the same time.

Changing the Sensor

It is always advisable to disconnect the vehicle battery before carrying out any work within the engine bay.
The connector for the sensor is found at the top of the fire wall near the coolent expansion tank. It is the grey connector, in order to release it there is a small clip on the top (or bottom) of the connector that needs to be pressed as the connector is gently pulled, disconnect this connector.

Bank 1 sensor 1 can just be seen from the top on the engine bay if you look down toward the exhaust below the throttle linkage. Shown here after the throttle linkage assembly has been removed.

Follow the instructions for the bank 1 spark plug change Here for details of how to remove the inlet manifold in order to access the sensor. Release the sensor using the O2 sensor removal tool.

Replacement of the sensor is the reverse process of removal. There is no setting to be done, except to complete a drive cycle with the vehicle, or reset the engine management light.