Find Out What the Diminished Value of Your Car is If your car has been involved in an accident it will be worth less money than it was before. Even if your car is fully repaired, it will have decreased in value. This is called diminished value. If you think of things from the perspective of a potential buyer, this diminished value makes sense. If two vehicles were exactly the same in every way except one of them had been in an accident, which one would you buy? All things bei