Happy to help - Sucks when you do the maintenance yourself and it doesn't end up the way you had planned. I'm not sure that it is a symptom of having the battery disconnected for an extended period though as many guys in the USA have their X purely as a winter snow mobile so leave it in the garage for months with the battery disconnected. Hopefully it gets rectified soon enough for you without the dealer taking last months pay check.

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2004 E53 4.4L N62