At 230K kms, passenger side front and rear wheel bearings, and a ball joint done by my mechanic last week.

Yesterday, I removed the headlight to replace the HID bulb on the driver side. The original bulb still looked good and replacing it did not fix the problem. Now, I'm not sure if it's the igniter or the Xenon module. Quite expensive for a trial and error but I can't think of anything else that could be wrong.

One thing that should have triggered my mind that it may not be the bulb is that there is no message on the dash. There was a message last time when the bulb on the passenger side was out 2 years ago.

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2006 X5 4.4i LeMans Blue