Dealer diagnosed: Power steering pump failure
Replacement part # dealer advised
https://www.fcpeuro.com/products/bmw...-32416769887oe
FCPeuro suggests (for the model/year car)
no active steering
https://www.fcpeuro.com/products/bmw...-32416779244-1
active steering
https://www.fcpeuro.com/products/bmw...is-32416779245
Leaving dealer to sort it.