You left out the most important detail: which engine but you left a clue that it's diesel.

The diesel x5 will have symptom you describe if the vaccum reservoir is having a problem.

Somebody recently had similar issue and it wasn't that so search xoutpost for similar symptoms and see if you can find it it was this year I'm pretty sure


–awr–

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)