Quote:
"[Q] What are the most common problems with a used Ford Fiesta hatchback?
[A] Diesel versions of the Fiesta have been known to suffer from injector issues which can be expensive to sort out, so keep this in mind if you decide you want one of these versions.
The plastics used for the dashboard and door cards mark easily, especially when children are regular passengers. Some owners have complained about the quality of the materials used in the cabin. The stereo also has a habit of failing, along with the heating and ventilation system which can develop a mind of its own.
There have also been several reports of water leaks, resulting in damp front footwells - this can cause mould in cars that sit for long periods of time. Lift the mats and check carefully when inspecting a car."
Source:
https://www.whatcar.com/ford/fiesta/hatchback/used-review/n340/advice