This is a more common issue then audi will admit, many people have had this problem and audi still wont replace all 6 ignition coils (they replace them on a as needed basis).
2002 Audi A4 electrical complaints
Page 4 of 4: complaints 71 to 76 of 76, newest first, as owners wrote them.
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Coil packs are failing on many of these cars. I had to have 2 fail before they would replace all 4. These should be recalled if this is happening so often to so many.
According to reports on audi forums, coil packs have been failing at an alarming rate. There is one per cylinder, and people have reported successive failures. Audi of america will only replace the failed item. There should be a recall, and all the defective items replaced at the same time.
While driving at any speed and with no warning headlights will go out and will not come back on. Dealer notified.
Consumer states that the ignition coil failed, causing engine to stall.
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