Ok this is my first time posting on here but I have been following for a long time.
I have a 2000 audi A4 1.8tq with an APR stage 3 kit. Boost is gone. I’ve done a pressure test and the system holds pressure/ no leaks. I’ve checked the N75 valve’s resistance. Run w/out wastegate actuator vacuum hose connected. Cleaned out MAF and air filter. The car sounds like its running great, I just drove it to LA like this. If I stay at WOT until redline I can hit a little over 5 psi. Sometimes I get a system too lean code but after a lot of driving usually.
I'm stumped. I have about 50k miles on the stage 3 turbo kit.
Any ideas?

 

Did you check to see if the wg arm is still connected to the wg?

 

Update.
The WG actuator was bad, not holding wg closed completely.