16th June 2012, 13:19
Join Date: Dec 2001
Location: Rockland County, NY
Thanked 67 Times in 44 Posts
These instructions should show you how to access the rear light from the trunk: DIY LCI taillight retrofit - 5 Series Forums
Once you get access, first try cleaning your bulb/socket contacts to see if it just a bad connection.
If that doesn't work, identify the part number for the bulb you need from realoem.com and buy it from getbmwparts.com (or your local dealer at likely a higher price)
The fast blink would be associated with a resistance issue, which hopefully should be solved once you change the bulb(s) that are out.
Please report back what your ultimate resolution is for the benefit of others.
2008 ///M5 | Space Gray | Black perforated leather | Aluminum | SMG
M167 wheels, Rogue Engineering exhaust (Section 3), Eibach springs, 12mm front/rear spacers, matte black grill/side gills/trunk badge, painted calipers (black) with ///M decal, body color reflector, 50% 3M tint, V1 hardwire