Oxygen Sensor Location and replacement?

this engine is a straight six, Bank 1 cylinder 1 2 3 bank 2 cylinders 4 5 6 if I am not mistaken. Here is a guide to help walk you through the steps of replacing the sensor with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Oxygen sensor emissions control EU6 DDE7
In order to comply with the more stringent exhaust-emission regulations of the EURO6 (EU6) standard, exhaust emissions control is implemented on vehicles with EURO6 by two oxygen sensors. The oxygen sensors are located in front of the oxidation catalytic converter and after the oxidation catalytic converter.To reduce nitrogen oxide emissions further, an oxidation catalytic converter with a modified coating is used.

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Oh some one told me it was bank 2 sensor 2 that's why i order part#
11787545075 from BMW thinking this was the sensor.

I'm not sure what happened.do you have the code? any way there is a bank 1 sensor 2 .have a great night.

Right Manifold
Front
Oxygen Sensor
11787558073
365.19
Rear
Oxygen Sensor
11787545075
292.13
Left Manifold
Front
Oxygen Sensor
11787558055
365.19
Rear
Oxygen Sensor
11787545074
292.13