Alright so recently my turn signal has stopped working. I went to the bmw dealership and bought the ''special'' factory bulb that the guy gave me.
I changed the bulb and it still is not working.
the car is a bmw 328xi 2007 coupe btw.
Has anyone ever had this problem / does anyone know how to fix that ?

blinker fluid is probably low, bmw dealership will have it

You need to check voltage at the bulb socket with the signal on.

http://www.autozone.com/electrical-and-lighting/turn-signal-light-mini-bulb/bmw/328xi/2007/6-cylinders-3-0l-efi-dohc?filters=4294955770

whats "special" about them?

I'm pretty sure you aren't suppose to touch the glass part of the light when you put them in

first guess is if the bulb does not even light up is a bad wire connection. if it lights up but does not blink, I guess the actual switch is bad.

If im not mistaken they are can-bus bulbs. Sends a signal back to computer.

Could literally be anything

A bad ground
A bad bulb
Installed wrong
Bad harness
loose ground
Bad fuse
Bad MFS

I have a feeling the advice will fall on deaf ears but... swap the tail lamp assembly temporary so you can test if its from the circuit or after ie bulb. if its before the tail lamp assembly try what fmx and ozzy said, gl.

This post was edited by charliemurphy on Oct 4 2015 08:46pm

this

use process of elimination to find your problem