Loss of Boost Pressure while Driving on the Highway - Help Please

[Quattro06]

I have recently been experiencing loss of boost pressure when I drive on the highway for periods longer than an hour or so. Normally I get around 18-19 psi peek with a small drop down to 16-17 psi but now I will only get between 4-6 psi max in any gear. This has happened a few times with the first time happening while I was down at the Tail of the Dragon back in November while driving on the Cherahola Skyway. Once I turn the car off and let it sit for a few minutes everything is back to normal so I'm really lost at what to do next.

The last time this occurred it happened on my 30 min commute to work, so it seems like it is starting to happen more often on shorter drives. When it happened the last time I got a CEL which I scanned when I got home from work. The 3 codes I got were:

Address 01: Engine Labels: 06F-907-115-AXX.lbl
Part No SW: 8E0 910 115 M HW: 8E0 907 115 D
Component: 2.0l R4/4V TFSI 0070
Revision: --H10--- Serial number:
Coding: 0104010A190F0120
Shop #: WSC 01286 386 08256
VCID: 2B5EEE7B8AF7CC66D8-807E

3 Faults Found:
008567 - Bank 1; System Too Lean off Idle
P2177 - 001 - - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100001
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 230744 km
Time Indication: 0

Freeze Frame:
RPM: 1676 /min
Load: 32.9 %
Speed: 66.0 km/h
Temperature: 90.0∞C
Temperature: -3.0∞C
Absolute Pres.: 970.0 mbar
Voltage: 14.097 V

000313 - Oxygen (Lambda) Sensor B1 S2
P0139 - 004 - Response too Slow - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 232075 km
Time Indication: 0

Freeze Frame:
RPM: 1642 /min
Load: 10.2 %
Speed: 79.0 km/h
Temperature: 90.0∞C
Temperature: 8.0∞C
Absolute Pres.: 970.0 mbar
Voltage: 14.351 V

004372 - Oxygen (Lambda) Sensor; B1 S2
P1114 - 008 - Internal Resistance too High - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 232075 km
Time Indication: 0

Freeze Frame:
RPM: 1642 /min
Load: 10.6 %
Speed: 79.0 km/h
Temperature: 90.0∞C
Temperature: 8.0∞C
Absolute Pres.: 970.0 mbar
Voltage: 14.224 V

I'm wondering if it's the PCV or a vacuum leak somewhere. Any help on what to check/look out would be greatly appreciated. Thanks so much!

[shahk62]

Generally the lean running would be a vaccum leak. Which diverter valve do you currently have?


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[Quattro06]

Currently running the Forge diverter valve.

[esandes]

the one time i got a code for low boost pressure the air filter was plugged up. i cleaned it and the car ran great.