We've had a fair bit of problems with the 2.0 common rail engines when they hit around 50k. Quite a few have been and had the injectors replaced or re-phased and all the high pressure lines replaced [not too expensive in the grand scheme of things though].

Other than that though, cracking cars and great value for money

Not had so many 1.6 TDCi's and [touch wood] they don't seem to be as troublesome from what I've seen