error code assistance

[BobS]

The SES light on our 2001 X5 3.0, lit yesterday. I read the code with my Actron and is follows: "P0365". I looked up the code and the following is the description: "Camshaft position sensor B - Bank 1 circuit malfunction". The parts manager at my local BMW dealership told me that it could either be the camshaft position sensor for the intake or exhaust but unless I brought the car in and they read the code on their diagnostic he could not be sure. I've read the article on this site about how to replace the sensor but I'm not sure from the error message which one is the culprit. I need a little education at this point. Which sensor is sensor B and which is A? And what is "Bank 1" ?. This eludes to the idea that there are multiple banks. When I think of a bank, I think of a number of objects in a row such as a bank of cylinders on the engine. But my BMW dealer parts guy told me that there are only two sensors and they are on opposite sides of the engine. So I'm a little confused and need some guidance. Thanks.