Hey guys!
Just thought I'd post this here for others that may come across the same problem since I searched for quite a while until I found the solution.
I have an '09 135i with the HPFP recall done, dual cone intake, downpipes and JB4.
This happened to me the first time a few months ago when I tried topping the car. I was going around 220 km/h in 5th gear WOT when suddenly I felt like the car hit a wall... half engine light went on fans at full speed, etc. Initially I thought I blew the charge pipe because of the jolt but after inspection everything seemed fine, restarted the car and I was good to go. Then it happened again in 4th gear, and again in 5th gear and again, and again. Only at WOT and only in 4th gear and up at high rpm and high speed.
Changing from map 5 to map 1 or 2 didn't do anything.
Here is exactly what I was getting:
https://www.youtube.com/watch?v=FELK45QRX_Q
Most posts i found said it was faulty injectors or spark plugs, or even the HPFP!
Finally before bringing the car to the dealership for a $135 "diagnostic", I found this (read the whole thing!):
http://www.n54tech.com/forums/showthread.php?t=19997
also read:
http://www.n54tech.com/forums/showpo...75&postcount=1 and read the part about FOL (Fuel Open Loop)
TL;DR If you are getting these errors, lower the Open Loop setting either by USB or with the steering wheel controls. Mine was at 94 and since lowering it to 70 all my troubles have went away!