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Hello folks im new to the forum im hoping someone can help me please my mum who’s a nurse has a Audi A8 2006 3.0 diesel had the car for 8+ years now with no faults whatsoever just recently in the past few months after she opens ans closes the boot half a dozen times this is operated with a motor for open and close it is draining the battery so I changed the battery for a new one and it’s still doing the same thing the car won’t start on fingerprint start only with key and it comes up on the battery computer that it’s only got 30% after open the boot and closing again the car is charging fine she travels 500 miles a week init and don’t miss a beat any ideas please cheers Happy new year
 

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Battery V low after using the boot indicates an earth short. Check the wiring and the motor for the boot. Likely the motor commutator is dirty. My A6 uses pnuematics for the door boot locks.
 
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