I had the tail light warning come on my '01 325i. I replaced all the bulbs and plugged everything in and nothing happened. I messed with the wires and then everything came on. The problem is that the brake light socket will not fit the 21/4 watt bulb. It will only fit the 21 watt bulb like the blinker socket uses. I looked at the lights I removed to see what BMW or the previous owner had in there and there was also a 21 watt bulb in that socket. I think this would contribute to the blinker blinking fast ever since I got the car over a year ago. I think the wire may have something to do with it or is it the bulb that doesn't fit well because it is not the right size? I am afraid I'm going to have to buy a new bulb holder because it definitely does not fit the right bulb. Any ideas??