TorqFix

Coding convenience system control unit using fault reader V.A.G 1551 — VW

Coding convenience system control unit using fault reader V.A.G 1551 on VW: factory workshop procedure. Full factory text, tools and checks.

Workshop procedure for VW — the factory write-up, straight from real workshop data.

factory workshop text

📋 Procedure

Notes:

When supplied the control unit is precoded according to the vehicle equipment.
The coding is performed with the fault reader V.A.G 1551=>Page
01-179
.

Connecting fault reader => Page
01-170
.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys -0- and -7- (with 07 the function "Code control unit" is selected).

Rapid data transfer
Q
07 Code control unit
Indicated on display:

Confirm entry with the Q key.

Code control unit
Q
Enter code number
XXXXX (0-32000)
Indicated on display:

- Enter code number according to table:

Coding table

Vehicle equipment · Code number
Central locking · 1 door opening · 00256
2- Elect. windows · All door opening · 00257
Central locking · 1 door opening · 00258
2- Elect. windows and memory · All door opening · 00259
Central locking · 1 door opening · 04096
4- Elect. windows · All door opening · 04097
Central locking · 1 door opening · 04098
4- Elect. windows and memory · All door opening · 04099

Confirm entry with the Q key.

1J0959799J 03
Conv. cent. CU
0001⇒
Coding XXXXX
WSC XXXXX
The control unit identification number will be displayed with the appropriate index letter, the code number and the workshop code.

If the contents of the display are as shown then the coding is successful.

If the code number entered is not accepted by the control unit, the previous coding will appear in the display:

1J0959799J 03
Conv. cent. CU
0001⇒
Coding XXXXX
WSC XXXXX
Indicated on display:

In this case the control unit has not been programmed with the relevant data for the vehicle.
A check must then be completed to see if the correct control unit for the vehicle has been installed (compare Part No. and letter index), or whether an incorrect code number has been entered.

Repeat coding.

If the control unit cannot be coded (correct control unit, correct code number), the control unit is defective.

Furthermore, at this point the door control unit is called-up and checked.

Ending function:

Press ⇒key.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys -0- and -6- to end the output.

Rapid data transfer
Q
06 End output
Indicated on display:

Confirm entry with the Q key.

Rapid data transfer
HELP
Enter address word XX
Indicated on display:

Switch off ignition.
Disconnect connector to fault reader V.A.G 1551.

Is this your exact engine?

TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.

Ask about my car →

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

The story behind TorqFix →

Workshop data on this page last updated 20 Sep 2026.