5. MINI Cooper S
The MINI Cooper S may be a fun, stylish compact car, but is also one to avoid purchasing used. There’s no denying its popularity on the market, but the Cooper S isn’t free of troubles. In its current form, the Cooper S is powered by a turbocharged, 1.6-liter engine with 181 hp and 177 lb-ft of torque.
The Cooper S, according to Consumer Reports, has reliability issues with its engine, engine cooling, transmission, and fuel system. Other categories that received poor marks over the years include Climate System (2003), Suspension, Exhaust, Paint and Trim (2008), Squeaks and Rattles, and Body Hardware.