2004 BMW 645Ci Problems
RepairPal has identified the most common problems with the 2004 BMW 645Ci as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.Refine by vehicle
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If the brakes are squealing, there's a good chance it is the brake pad wear sensor. A new design was implemented in January 2006 and can be identified by its green color.