Hi.

I bought a second hand T5 multivan 4motion from 2008 a year ago. I wanted it with rear diff lock, but to my surprise the day I was to lock the diff, it did not work, and I found out the rear diff had been replaced by a non-lockable rear diff.

So I plan to re-fit an original lockable rear diff. This work could be like a retrofit, maybe, but I suspect it should be way easier since I know my van will easily accept the modifications as it accepted them when she went out of the factory.

So I am posting here a AWD scan and a complete autoscan. In the AWD section, I'd appreciate if someone with a 4motion from 2008 with rear diff lock can compare the codes below against theirs, and give me some clues on what I should be doing / considering / taking care of before starting the job --- even before buying a lockable differential.

AWD section:
Code:
Address 22: AWD        Labels: None
   Part No: 7H0 907 554 F
   Component: HALDEX 4Motion      2110  
   Coding: 0000002
   Shop #: WSC 49856 001 1048576
   VCID: 33331D04772445EF53F-513C
No fault code found.
Full autoscan for reference:
Code:
Thursday,14,February,2019,02:13:28:04823
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 18.9.1.0 (x64)  HEX-V2 CB: 0.4437.4
Data version: 20190114 DS296.0
www.Ross-Tech.com

VIN: WV2ZZZ7HZ8H133087   License Plate:

Chassis Type: 7H (7H - VW Transporter/Multivan (2003 > 2010))
Scan: 01 02 03 08 09 0B 0D 15 16 17 18 19 1C 22 2D 37 45 46 47 56
          57 6E 76 77 78 7D
 
VIN: WV2ZZZ7HZ8H133087   Mileage: 236970km-147246miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 070-906-016-BPC.clb
   Part No SW: 070 906 016 DR    HW: 070 906 016 DR
   Component: R5 2,5L EDC  000SG  1584  
   Revision: --H06---    Serial number: VWZ7Z0H6297210
   Coding: 0001172
   Shop #: WSC 36843 001 1048576
   VCID: 6393AD448744956FE3F-5184
No fault code found.
Readiness: 0 0 0 0 1
-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 7H0-907-37x-ESP.lbl
   Part No SW: 7H0 907 379 R    HW: 7H0 907 379 R
   Component: ESP MK25E1          0104  
   Revision: 00H31001    
   Coding: 0000607
   Shop #: WSC 02756 790 00000
   VCID: 44D14ED8228AF257FA5-513C
1 Fault Found:
00668 - Supply Voltage Terminal 30 
            002 - Lower Limit Exceeded
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 40
                    Mileage: 236975 km
                    Time Indication: 0
             Freeze Frame:
                    Count: 128
                    Count: 6913
                    Count: 128
                    Count: 255

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: Redir Fail!
   Part No: 7H5 820 045 P
   Component: CLIMA/AC            0303  
   Shop #: WSC 00000 000 00000
   VCID: 372B2914635CA9CF6F7-513C
No fault code found.
-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 7H0-937-049.lbl
   Part No: 7H0 937 049 AD
   Component: BORDNETZ SGVER 1.0  2101  
   Coding: 0000103
   Shop #: WSC 02756 790 00000
   VCID: 74B1DE1832AA02D78A5-513C
No fault code found.
-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 1C0 909 605 F
   Component: 11 AIRBAG VW61 0R   0004  
   Coding: 12593
   Shop #: WSC 02756  
   VCID: 270BF954B6FC394FFF7-513C
No fault code found.
-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 7Hx-920-xxx-17.lbl
   Part No: 7H0 920 861 E
   Component: KOMBI+WEGFAHRSP VDO V03  
   Coding: 06113
   Shop #: WSC 32919  
   VCID: 2E050C70990668073C1-513C
   WV2ZZZ7HZ8H133087     VWZ7Z0H6297210
No fault code found.
-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: 7H0-819-008.lbl
   Part No: 7H0 819 008 R
   Component: Standheizung        0209  
   Shop #: WSC 00000 000 00000
   VCID: 3B2335245F748DAF8BF-513C
No fault code found.
-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
   Part No: 6N0 909 901 
   Component: Gateway K<->CAN    0001  
   Coding: 00022
   Shop #: WSC 02756  
   VCID: 70B9D20843B23EF76ED-513C
No fault code found.
-------------------------------------------------------------------------------
Address 22: AWD        Labels: None
   Part No: 7H0 907 554 F
   Component: HALDEX 4Motion      2110  
   Coding: 0000002
   Shop #: WSC 49856 001 1048576
   VCID: 33331D04772445EF53F-513C
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 7H0-959-433.lbl
   Part No: 7H0 959 433 B
   Component: C11 KomfortgerŠt     0004  
   Coding: 00025
   Shop #: WSC 02756  
   VCID: 323D18008D3E4CE7589-4B1E
No fault code found.
-------------------------------------------------------------------------------
Address 6E: Ctrl Head Roof        Labels: 7H5-919-044-W1.clb
   Part No SW: 7H5 919 044 J    HW: 7H5 919 044 J
   Component: J702  Dachdisplay   0500  
   Revision: 1010007S    Serial number: 00000000060769
   Coding: 0000003
   Shop #: WSC 02756 790 00000
   VCID: 392F2F2C5548BFBF993-513C
No fault code found.