You'll be surprised at how much value your car has lost. A small scrape and broken tail lamp, less than $2500 to repair, St Lucie Appraisal came up with a diminished value of $8,500. Tesla buyers are picky and a bad Carfax could impact the car down the road, for example, if it gets hit again their insurer will balk at paying any diminished value because the car had a prior loss.