You can read our classic car review of the Citroen 2CV here:classics.honestjohn.co.uk/reviews/citroen/2cv/ which includes information on what to look for when buying one, but in short the key things to look for are rusty chassis and body, oil leaks and faulty cooling systems as well as water leaks. We would recommend looking for a 1982-on car as these have inboard disc brakes rather than drums.

With a car like this, it is worth paying a little more to have an example that has been well maintained.