I remember reading online at one time if the cost of your car repair is about .5 of the KBB value of the car , it would be better worthwhile to scrap it and buy a different car. Not sure if this makes economical sense although as a the different car will still be more expensive. I have a feeling mileage has an effect on this too. As your car goes up in miles it probably would make less economical sense to buy the repair vs buying a used car.
Wondering if you guys have some thoughts on this topic or know a good rule of thumb for this.