Connecting vehicle diagnostic, testing and information system VAS 5051 A and selecting functions — AUDI
Connecting vehicle diagnostic, testing and information system VAS 5051 A and selecting functions on Audi: factory workshop procedure.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
Connecting
vehicle diagnostic, testing and information system
VAS 5051 A
and selecting functions
Requirements:
Selector lever in position
“P”
or
“N”
and handbrake applied.
Vehicle voltage supply OK.
Fuses OK
Current flow diagrams, Electrical fault finding and Fitting locations
Earth connections for gearbox okay
Check earth connections for corrosion and poor contact, repair if necessary
Current flow diagrams, Electrical fault finding and Fitting locations
.
Check battery earth strap and earth strap between battery and gearbox.
Procedure
Connect the
vehicle diagnostic, testing and information system
VAS 5051 A
to the diagnostic connector using
diagnostic cable
VAS 5051 A/1
with the ignition switched off.
WARNING
Observe safety precautions
Chapter
.
Note
If a fault message appears on the display
Operating instructions for
vehicle diagnostic, testing and information system
VAS 5051 A
.
Switch on ignition.
or
Start engine.
Display on
VAS 5051 A
:
Touch
Vehicle self-diagnosis
button.
Display on
VAS 5051 A
:
Note
Select the diagnostic function
“00 - Interrogate fault memory - complete system”
from list
1
to start the automatic test sequence, i.e. fault memories of all vehicle systems with self-diagnosis capability will be interrogated.
From list
1
select vehicle system
“02 - Gearbox electronics”
.
Wait until next screen display appears.
Display on
VAS 5051 A
:
2
Control unit identification of gearbox control unit.
Control unit identification of gearbox control unit (example)
02 - Gearbox electronics
Vehicle system
4B0927156..
Part No.; for allocation refer to
Parts catalogue
AG5 01L
5-speed automatic gearbox 01L
4.2l5VT
4.2 litre engine, 5-valve turbo
RoW market:
Rest of the world (unless otherwise stated, applicable for all countries, except USA and Canada)
1214
Control unit software version (data level)
Coding 1
Control unit coding
Chapter
Workshop code 12345
Workshop code of
VAS 5051 A
which was used to perform the last coding
If readout
“Vehicle system not available”
appears in display zone
1
:
Check:
Voltage supply to diagnostic connector
Current flow diagrams, Electrical fault finding and Fitting locations
.
Wiring connections from diagnostic connector to
automatic gearbox control unit
J217
Current flow diagrams, Electrical fault finding and Fitting locations
.
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.