A6 Sedan V6-2.8L (AHA) (1998)
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Disconnect battery Ground (GND) strap -arrow-, with ignition switched off.
Audi RS6:
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Turn locks -arrow- counterclockwise and remove cover -1-
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Remove cover -1- off upward.
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With ignition switched off, disconnect battery Ground (GND) cable -arrow-.
All:
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Open fuel filler cap briefly and close again
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Remove rear seat bench.