E70 4.8 Camshaft Sensor B location, which one?

[Fizgig]

Hi All - can anyone help with this, had a look through and can't see the answer on here.

I'm getting an OBD DTC of camshaft bank 2 Sensor B error, combined with some hesitation. Worked out which is bank two (left hand side from divers seat) and found where the sensors are (Right at the back, a pain to get to under the wiring loom), but there are two, one higher up than the other.

Anyone know which is B, logic would suggest its the lower one?

Gonna save me a lot of pain replacing the wrong one, putting everything back together again etc

Cheers