A/C failure on the E90? Ouch. Are you talking about the front or rear fenders? It could be a bent control arm on the front (if the wheel is forward or rearward) or a broken spring, crushed spring pad, failed strut bearing, etc, if the car is lower (so the wheel is tighter to the fender all the way 'round).
BTW, Princess Auto now sell the Eastwood fender roller. I'm waiting for it to go on sale and I'll be making a post about a purchase where we all go in. I'll like to have another go at my rears.