I found that we (S40 owners) are suffered by the noise problem. My T4 did, I also took it to the dealer, but I surrender. The sunroof, the piece of decoration sticked on the door, even the engine create strange noise. Anyway, from 80's to now, Volvo never manufactures a very good compact sedan/wagon (forget about 460), S40 is already the best. I don't complain about that, still happy with the acceleration and overtake ability, but I wish that they'll learn and build a better compact car (C40/V50?) in the future.