P0101 & p02299 faults

[weebrads]

Hi all, I have the faults showing on a 2.0 tdi 140bhp engine, been told it could be a million things but obviously it's a maf and low boost fault, all pipes and maf have been checked or changed, hoping somebody has encountered these issues and have a successful fix. Cheets

[JimA4B6]

Is it modified in any way? Remap? does it hit limp mode at certain roads? inclines?

[Crasher]

I think that second code would be

16683 (P0299) - Boost Pressure Regulation: Control Range Not Reached

Not P02299. In my experience this is always a problem with the vacuum control system such as a boost solenoid fault or more often, a vacuum pipe leak BUT with code

16485 (P0101) - Mass Air Flow Sensor (G70): Implausible Signal

I also think about a blocked cat or DPF so what is the cars year and engine code?