A4 Quattro Wagon V6-2.8L (AHA) (1998)
Console: Service Precautions
Disconnect the battery Ground (GND) strap before working on the electrical system
NOTE:
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Before disconnecting the battery, determine the correct coding for the anti-theft radio.
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After reconnecting the battery, check and activate the vehicle's electrical equipment (radio, clock, comfort and convenience features, etc.).