16: PT Cruiser Convertible
In addition to the original PT Cruiser released, there was also the short-lived PT Cruiser Convertible. Chrysler was hoping to appeal to a younger demographic, and thus a convertible was the next best option. The main problem is that the PT Cruiser isn’t the most appealing car to turn into a convertible model (via Hagerty).

The PT Cruiser convertible was available with an optional turbocharged engine. While performance was initially compelling, poor reliability crept up quickly. There were many costly repair issues that made the PT Cruiser Convertible a pain to live with. Car shoppers weren’t willing to deal with these reliability issues.