At least yours was cheaper to fix than mine. I have been going crazy trying find a rattle in the back of my wagon. Found it when I noticed the back of my bumper was sitting a hair low. Like a 1/4 inch or so while looking at the bumper cover in relation to the 1/4 panel belt line. Looked under the bumper to see what was wrong and found the mounts on the bumper were shattered. The bumper shocks are all that is holding it on. The bumper moves vertically about 1/2 to 3/4 of an inch when you pick it up. Needless to say I have to pick up a new bumper this week or next. $125 Needless to say if you have ever picked up a Volvo bumper you will find they are quite light.