There is a technical term for a car that is defective beyond repair and that is called a "lemon". Some states have certain laws to protect the car buyer. Each state only has their own requirements that they qualify for in which it depends on a few things.
Number of miles driven- the defects happened within a certain number of months or maybe the miles driven.
Substantial Defects- the defects are major in which it involves the operation of the vehicle. This would include the brakes, transmission, or other major parts of the vehicle.
Repair Attempts- you have your mechanics chances to repair the problems. If the mechanic cannot repair the problem then of course it may be considered a "lemon".
The amount of days in the shop- Your car has to at least been in the shop from 30 days to a year. If it cannot be fixed by then it is time to get a new vehicle.
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