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I have been told that if you disconnected and reconnected the battery a code gets set that prevents the vehicle from starting ? You have to use a cigarette lighter adapter to maintain voltage to the computer or take it into a dealership who can reset the computer code .

I can't swear by that answer, but its worth a call to a real mechanic to ask.

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Q: Have a Audi 2001 A4 wont start changed spark plugs checked fuses Should I check relay switch and if so where is it located Or could it be fuel pump located in the trunk and how do you check that?
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