According to the holding in American Manufacturers Mutual Ins. Co. v. Schafer, once a vehicle has been damaged and repaired as a result, it is going to be worth less than a comparable vehicle that has not been in a wreck.
In light of said holding, in the situation where one's automobile is damaged as a result of another driver's negligence, the 'at fault' driver's insurance company (third party insurance) may be liable to the party not at fault for the diminished value of thier vehicle.
The aforementioned discussion is of a general nature and should not be construed as legal advice. Should you have a legal question, please consult a licensed attorney.
