One problem related to headlights has been reported for the 2006 BMW M5. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 BMW M5 based on all problems reported for the 2006 M5.
Headlight went off while driving, when I went to replace the bulb discovered that all the wiring inside the headlights have the insulation crumbling off causing exposed bare wires to short together. This is unacceptable on a car that is only 7 years old. I researched on the internet and found that is a common problem on Bmws. If your warranty expired BMW will not fix it. This is especially dangerous at night went the headlight start to flicker on and off.