On Board Diagnostic (OBD)
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=...
Test prerequisites
The fuses must be OK.
The main fuses must be OK.
The battery voltage must be at
least 11.5 V.
Ground (GND) connection
between engine and body must
be OK.
All electrical devices, e.g. lights
and rear window heating must
be switched off.
If the vehicle is equipped with air
conditioning, it must be turned
off.
Selector lever must be in
position "P" or "N" on vehicles
with an automatic transmission.
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