Hi, I just bought my is200 yesterday and I already noticed a problem. At 1500rpm there seems to be a rattle coming from the engine. I slowly built up the revs to about 5000rpm and there was no more sign of it although it died out slowly as I built it up. Im a bit worried because I dont know what it is and wont know how much it will cost. My car is a 2000 model is200 with 82000 miles on it. Can anyone help me please? Thanks