i got these error codes at the same time in my 1.8t a4 with 150k miles and a turbo chip,
P1557-Charge Pressure Control Positive
P0411-Secondary air injection incorrect flow
anyone know how to fix either of these errors? any help would be great. Before i got these errors i tested the turbo with the chip and was getting around 15 psi while at a steady speed of 40mph if that matters. Also sometimes it smells like oil is burning while im driving

 

bump
After reseting the codes a few time i get them back after a few miles, always at the same time, could it be because i never replaced the diverter valve?