Had similar code description recently on an E46 similar age,with that one they were hard codes and would not clear,after checking all lives and earths at yaw sensor bit the bullet and bought new genuine at £350 plus VAT, as soon as plugged in DSC light cleared with no coding required,looks to me as though you have a double fault that was partially fixed with the ECU repair but for whatever reason it has now thrown up the yaw sensor?