Connecting fault reader V.A.G 1551 and selecting engine electronicscontrol unit — AUDI
Connecting fault reader V.A.G 1551 and selecting engine electronicscontrol unit on Audi: factory workshop procedure for engines BBY.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📐 50 workshop diagrams for BBY
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
V.A.G 1551 Fault reader
V.A.G 1551/3 Cable
Test conditions
Fuse OK.
The battery voltage must be at least 11.5 V.
Earth connections on engine and gearbox OK.
Work sequence
Connect up fault reader V.A.G 1551 using diagnostic cable V.A.G 1551/3A.
Warning:
When carrying out road tests using fault reader V.A.G
Note:
The following description only covers the procedure for performing self-diagnosis with fault reader V.A.G 1551.
V.A.G - SELF DIAGNOSIS
HELP
1 - Rapid data transfer*
2 - Flash code output*
Indicated on display:
* Appears alternately
If no display appears, check diagnostic cables:
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
Depending on the function required:
Switch on ignition
or
Start the engine => Page
01-4
: table of "Functions which can be selected".
Switch on printer with the Print button
(Warning lamp in button lights up).
Press key 1 for "Rapid data transfer".
Rapid data transfer
HELP
Enter address word XX
Indicated on display:
Rapid data transfer
Q
01 - Engine electronics
Press keys 0 and 1 for address word "Engine electronics" and confirm entry by pressing the Q key.
Rapid data transfer
HELP
Control unit does not answer
If the display shows one of the messages reproduced here, check the diagnosis wiring.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
Rapid data transfer
HELP
K wire not switching to earth
Rapid data transfer
HELP
K wire not switching to positive
036 906 0034 Q
1.4l/R4
EPC
AG
D00 ⇒
Coding 31
WSC 12345
The display on fault reader V.A.G 1551 will show the control unit identification. For example:
- .......... · Control unit number (see also Parts List)
- 1.4 ltr. · Engine capacity
- R4 · In-line engine, 4 cylinders
- EPC · Electronic Power Control
- G / - or no display · Vehicle with or without cruise control
- SG / - AG · Manual gearbox / Automatic gearbox
- D00 · Software version of control unit
- Coding 31 · Control unit coding
- WSC 12345 · Workshop Code of V.A.G 1551 which was used to perform the last coding
Press ⇒key.
WAUZ8ZZYN02126
AUZ7ZOW0801181
Indicated on display (chassis No. of vehicle)
WAUZ8ZZYN00002341: 17-digit vehicle identification No. (chassis No. of vehicle)
AUZ7Z0X0590944: 14-digit Identification No. for immobilizer control unit
Press the ⇒key.
Rapid data transfer
HELP
Select function XXX
Indicated on display:
For further steps see repair procedures.
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.
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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.