Check the plastic gear - in some cases a worn gear can present the faults/code you are seeing.

It's easy to check (and replace) and is the first place to look.

If that's OK, then the steering angle sensor may be suspect; although the codes don't point to the SAS, once again these codes have been presented in cases where the SAS is worn.

The other code appears to be related to the Servotronic steering. I'm not sure how/if the Servotronic steering interfaces with the DSC. I think it does, so they me be related. Is the steering heavy (more than normal I mean!)?

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)