I'm thinking of buying a second hand Focus for the wife. The model I'm interested in is the [b]1.6 TDCI Titanium 5dr 110 [DPF][/b] from 2009/2010.
Can anybody advise me on 'problems to look out for' when taking one of these out on a test drive?
Or to put it another way, are there any common problems with this type/age of Focus which can be spotted before buying?

Thanks in advance,