Last night I got the P0170 on my coupe turbo (Z20LET).
I have EDS Phase 3, VXR turbo, intercooler, VXR injectors, EDS precat... etc..
The car was not boosting as it should, it was only going to 0,8 bar overboost (as it should go up to 1.5 bar overboost), and some 30 km since I noticed that I got the "engine check" light.. I used the pedal test to find out what fault it is, and the code is: P0170 - Fuel trim bank 1 malfunction.
I had a similar problem few years ago when my AFM went pop, the car was also not boosting properly, and few miles later the check engine whould light up. Could that be it again?
Till tomorow the car was going fine and boosting properly, with no problems.