Q: engine coil falure on 2006 BMW 330i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
what would cause an engine coil to fail at 47,000 miles and if all six coils are replaced what would be the expected life span for them.
(1) Answer
I find that BMW coils go out in short order. I used to work in a BMW shop and we would just replace them at 60k, if they even made it that far. I find that most BMW vehicles are awesome to drive but typically take much more $ to keep them in top shape, kind of like owing a race horse.
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