Yaw Sensor Strange Readings, calibration, DSC light keeps coming

[pjc0603]

Hi everyone, i have a problem with my wife's E87 120D. The DSC light keeps coming on, and i get the 5E40 error code for the steering angle sensor. However, through a bit of research it seems that the steering angle sensor can be the result of a mismatch of the other DSC sensors, which it is. When stationary, the Yaw sensor is displaying +1.64, and no offset applied (0), it looks like this is what is throwing the system out and giving the DSC light about 5 mins into each journey. Before i replace the sensor, it looks like i should be able to calibrate the Yaw back to Zero through DIS/GT1. So far i have -

Checked through INPA the steering angle sensor, its fine but recalibrated anyway.
Through DIS/GT1 i recalibrated the lateral acceleration sensor.
Checked the wheel speeds, fine.
The Yaw is still showing +1.64, and fluctuates down to about +1.4. I can't see a way of recalibrating and applying an offset in DIS/GT1. The Service option modules seem more limited on the E87 than other models. I will attach a screen shot if i can work out how to on this forum.

Anyone have any ideas how to calibrate the Yaw specifically to Zero?

Many thanks

[HarryN]

How is the suspension alignment? When was it done last? Did you add in any new parts recently?