I have had my 172 since March 1st 2003 by april it had developed this clunking noise from the front drivers side when going around corners, I have now eventually got a deal from my local dealer to change my car to a 182 on the basis that i was not impressed as they could not fix the noise. I have a pretty good deal as it works out that i get a full refund on the 172.
I know alot of people have experienced this noise and therefore would advise them not to put up with it, it took 10 months to sort but I got there in the end.