Byte 0:
HEX - Chassis type
11 - Ibiza Hatch
13 - Ibiza ST
21 - Polo hatchback
41 - Fabia Hatch
51 - Polo Sedan
As you can see, there might be some options for Fabia station, Audi A1, etc. Therefore it's always good to google scans of similar cars to your own.
Byte 1:
HEX - Chassis type
01 - Fabia
02 - Polo and Ibiza
Byte 2:
HEX - Brake diameter
24 - Front 256mm disc - rear 200mm drums
28 - Front 256mm disc - rear 230mm disc
44 - Front 288mm disc - rear 200mm drums
48 - Front 288mm disc - rear 230mm disc
Byte 3:
HEX - Chassis type
DB - Fabia, Ibiza
C2 - Polo
Byte 4:
HEX - Transmission
21 - DSG
41 - Manual
83 - Manual 2.0 TDI
Byte 5:
HEX 6D + VIN digit #13
Byte 6:
HEX 00
Byte 7:
HEX B2 + VIN digit #14
Byte 8:
The inverse of Byte 0.
You'll convert the HEX value to binary, i.e. HEX 21 = BIN 00100001. Then you invert the binary value, so 00100001 becomes 10000100. Finally you convert 10000100 to HEX, making 84.
Byte 9:
HEX 25 + VIN digit + 15
Byte 10:
Inverse of byte 2 (see byte 8 for description)
Byte 11:
HEX E2 + VIN digit # 16
Byte 12:
Inverse of byte 4 (see byte 8 for description)
Byte 13:
HEX D1 + VIN digit # 17
Byte 14:
Inverse of byte 6 (see byte 8 for description)
Byte 15:
HEX - Engine type
40 - BXW, CGGB, CBZB, CGPA, CBZA, CFHA + LHD
41 - CAVE + LHD
42 - CAYA, CAYB, CAYC, CFHD + LHD
52 - CFWA + LHD
82 - CFHD + LHD
Byte 16:
bit 0 = HHC active
bit 1 = TPMS active
bit 2 = XDS (electronic virtual differential) active (works on any car!)
bit 4 = 2.0 TDI engine installed
Byte 17:
HEX 00
Keep in mind, you should always use your head when making a code, and it never hurts to cross-check with the google method. The list is probably not complete, i.e. some RHD vehicles are missing from the list.
Soon to come:
ABS8.2
ESP9.0i PQ
ESP9.0i MQB
ESC 7E0
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