P0019 - 2007 BMW 550i

Question

I understand that the p0019 code means crankshaft position - camshaft position correlation bank 2 sensor b
My first question is where to located these sensor on my vehicle (2007 BMW 550i)
Second question is could it be something else giving the sensors false reading. Basically what's the best way to go about repairing this issue..

Answer 1

Dirty oil, or low oil can cause this issue, also low oil

if you have not changed the oil in the last 5k miles replace the oil and oil filter 

bank 2 sensor B is the VANOS solenoid (bank 2 is on the driver side)

the VANOS solenoid may need to be replaced if the code comes back after the oil change