Engine fault code p0368.

[Cpraieze]

I have a Mercedes Benz c300, 2017 with m274 engine. The vehicle check engine light is on and the car is having a long cranking before it starts. A p0368 fault code is showing in the code reader, camshaft sensor B bank 1 high. When a reset is done the engine starts normal but goes off immediately, but moments later goes into a long cranking, starts and run as long as I want. I've been trying to figure out which one is sensor B bank 1. I'll appreciate if anyone can tell me the location and also what to do. Thanks