TmS4

two different codes, any one had this? what did it end up being? I have a 2001 1.8t it has been sugested to me that it could be the secondary air, what are opinions on this? cars starts pulling boost to 5 psi every once in a while then cel comes on and it goes into full limp. when I erase the codes it takes 2 days to go back into limp. It starts to happen or go into full limp more if it is hot out or sitting at idle or cruising on the high way.

JG18TAVANT(FXK04)

i kinda sorta had that problem but i was running only lean it was a vacuum leak, check hoses?

Audi2ptzero

A leak anywhere after the turbo(s) could cause the car to run lean at idle and rich at part throttle. This is because at idle the leak lets in unmetered air and during part throttle leak lets out metered air. This could also cause the car to go into limp because the map sensor readings will be lower then requested boost.