Thanks for the advice above. To close this out and for future reference.
My BCM showed red with ‘communication error’. My SAS showed amber with internal fault.
Knowing kind of what to expect I took it to my local mechanic who replaced the SAS.
It is my understanding, which I do not state as fact, that you can align the new sensor with the old one. However, Volvo say it should be calibrated. For these reasons I paid for my local mechanic to do.
It was the SAS in the end and now the car runs well.
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