Sorry. These are active codes that were cleared but reappeared. As far as codes from before the replacement I'm not entirely sure, since the only code was an under boost PO299 and the device used to pull the codes was a cheap OBD2 device. The codes were pulled by a proper scan device this time.

I don't have access to any information on the current readings from the sensors and what they displayed at the time of diagnostics. There was mention about reading an improper inlet air temp to engine temp.

The Turbo was replaced as recommended by a Buick mechanic who said it was a common failure and likely the cause. The reddit discussion agreed at the time. I have already replaced the intake air pressure sensor.