Check Engine Light

Address 01: Engine Labels: Redir Fail!
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 5AH11— Serial number: AUX3Z0F9709393
Coding: 01060009190F0160
Shop #: WSC 02120 444 92496
VCID: A045A51B7352D63ECB-80F4

2 Faults Found:
008585 - Bank 2; System too Lean at Idle
P2189 - 004 - - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 159791 km
Time Indication: 0
Date: 2016.03.04
Time: 08:19:40

         Freeze Frame:
                RPM: 590 /min
                Load: 14.1 %
                Speed: 3.0 km/h
                Temperature: 90.0°C
                Temperature: 10.0°C
                Absolute Pres.: 970.0 mbar
                Voltage: 13.843 V

006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 -
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 159831 km
Time Indication: 0
Date: 2016.03.05
Time: 20:59:22

         Freeze Frame:
                RPM: 0 /min
                Load: 0.0 %
                Speed: 0.0 km/h
                Temperature: 78.0°C
                Temperature: 41.0°C
                Absolute Pres.: 980.0 mbar
                Voltage: 11.049 V

Readiness: 0000 0000

Address 11: Engine II Labels: Redir Fail!
Part No SW: 4E0 910 552 A HW: 4E0 907 552
Component: 5.2L V10/4V FSI ª0040
Revision: 5AH11— Serial number: AUX3Z0F9709393
Coding: 01060009190F0160
Shop #: WSC 02120 444 92496
VCID: A045A51B7352D63ECB-80F4

2 Faults Found:
004229 - Mixture Regulation; Bank 4; Range 1
P1085 - 004 - Lean Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 159776 km
Time Indication: 0
Date: 2016.03.03
Time: 16:21:23

         Freeze Frame:
                RPM: 652 /min
                Load: 18.4 %
                Speed: 0.0 km/h
                Temperature: 90.0°C
                Temperature: 24.0°C
                Absolute Pres.: 980.0 mbar
                Voltage: 14.224 V

004225 - Mixture Regulation; Bank 3; Range 1
P1081 - 004 - Lean Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 159791 km
Time Indication: 0
Date: 2016.03.04
Time: 08:19:34

         Freeze Frame:
                RPM: 582 /min
                Load: 14.9 %
                Speed: 0.0 km/h
                Temperature: 90.0°C
                Temperature: 10.0°C
                Absolute Pres.: 970.0 mbar
                Voltage: 13.843 V

So from my understanding this could be a vacuum leak, a maf sensor issue or a o2 sensor. what is the best way to check a vacuum leak? can I switch the maf’s from side to side to see if it goes from bank3/4 to bank 1/2? If it is the o2 sensor how do I know if it is pre/post cat and which cat is it on?

Thanks