Update. The code in BMW language is 4530 if that makes anyone feel better. I got a Foxwell scanner and can now reset the codes. The car will reset until it goes back into limp mode. If I drive it hard and keep it in the low pressure turbo or off the pedal I can drive it all day with no limp mode. If I accelerate slowly it sets almost immediately. I changed out the 2 EVIC ? Vacuum controllers, tested all the vacuum diaphragms, spun the turbo and checked for play, pressured up the intake tubing from the turbos to the intake, etc. I'm stumped. I do however show a constant coolant temp of 32 F which isn’t right but I can’t imagine it causing this problem. A friend of mine says pull the egr and intake and check for carbon. If it’s bad I guess it could cause issues but wouldn’t that make it run like crap on the low pressure turbo even worse?