Honest John is always a good place to look if you're buying a new car and uncertain of any major issues that may have been reported. Contributions are made by people in the trade, so they're generally (although not always) pretty reliable.

The 'What's Bad' tab is the one to look for; particularly the 'What To Watch Out For' section. Here's the relevant bit for the Mk6 Fiesta. Not much to worry about on the petrol Zetec-S, by all accounts; I've certainly not heard of any major model-wide problems yet: http://www.honestjohn.co.uk/carbycar...2/?section=bad