4,500 km - Engine Failure?

[Skiziks]

So, there we were on our way to a friend's funeral. Running a little late. Two lane highway.

150 km into a 180 km one-way trip, I'm passing several cars when there's a "pop" and instant hesitation like the engine had just quit. Then maybe a sec later, another pop and all "seems" normal.

Except, that "push back into the seat" feeling is gone. There seems to be all the engine revs, lots of exhaust noise, but the engine seems "flat".

Attend the funeral, restart the car 1.5 hours later and the "check engine" light comes on immediately.

I pull over, check the oil. Everything looks fine. Back on the highway, there remains something missing. There's just no "grunt".

Got home, ran a VCDS scan. Here's what I got:

2 Faults Found:

000257 - Mass Air Flow Sensor (G70): Implausible Signal
P0101 - 000 - - - MIL ON

Freeze Frame:

Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 4241 km
Time Indication: 0
Date: 2003.14.30
Time: 13:39:43

Freeze Frame:

RPM: 3931 /min
Load: 12.5 %
Speed: 159.0 km/h
Temperature: 96.0°C
Temperature: 32.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

000665 - Boost Pressure Regulation: Control Range Not Reached
P0299 - 000 - - - MIL ON

Freeze Frame:

Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 4250 km
Time Indication: 0
Date: 2003.14.30
Time: 13:44:16

Freeze Frame:

RPM: 4540 /min
Load: 71.3 %
Speed: 121.0 km/h
Temperature: 97.0°C
Temperature: 31.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

Readiness: 0000 0000

Any ideas? Blown Turbo or MAF Sensor failure? Or?

Thanks for the help. I plan on a dealer visit on Monday, but I'd like to go in "educated".