Sometimes it's heart wrenching to part ways with your junk car (think of all the adventures you've had together), but the time comes to accept that you've had a good run, and it's time to bid it adieu.
It's so damaged it makes more sense to sell your junk car than deal with repairs.
It costs more to fix up than it's worth.
The cost of keeping your junk car on the road is more than the sale value.
There are a high number of miles on the odometer.
It no longer runs.