Your Bently manual has helped identify the codes. What do they recommend as the fix? Bently should be able to identify the sensors that are related to the vanos and so far my experience has been that Bently gives you troubleshooting procedure to check the sensor.

Aside from the dealer, a trusted indie BMW mechanic would be in order here. If it were me I'd try to research the troubleshooting of the sensors. And when I was exhausted take it to the dealer pay for a diagnosis and decide separately how it is getting fixed.

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2002 BMW X5 3.0
2006 Ford Explorer 6 cyl
1998 VW Jetta 2.0 GLS
2004 Honda VTX1800C 100hp 97 lb of torque