I have read about other people with '06 models having batteries go bad within 6 months. Have the dealer test the battery. If it's bad they should replace it at no charge.

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'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Sport/Steptronic/Servotronic/Panoramic
Prem. Sound/Staggered 18" Style 114 Y-Spokes