This was back in 2004/2005 and we were still covered by warranty. Replacement was required. Part cost was $450 or thereabouts plus labor. We had no out of pocket charges. Hopefully one of our board techs can chime in with a more up to date estimate.
GL.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i