About 4 months ago I bought a used '03 Sentra GXE. At the time there was a slight sag in the rear-drivers side bumper cover (about 1/4-1/2 inch lower than rest of bumper). I brought this up and the dealer said it was likely a broken/missing clip. They claimed to fix it by replacing the clip and all was well until now. The sag is back. Before completing purchase my own mechanic did top to bottom and found nothing wrong (really went over it). The bumper cover itself has no visible issues, paint is great, no dents, etc, looks perfect (minus the sag).
So quick questions...
1.) Is this common? If so what is the usual cause?2.) Now it doesn't REALLY bother me, does leaving it me pose any future issues (ie water getting up in there and rusting, it falling off, etc).
Thanks!!