The 30-share barometer, which had gained nearly 620 points in the last four sessions, lost 83.43 points, or 0.48 per cent, to 17,171.28 . Stocks of auto, metal and capitalgoods sectors led the fall.Similarly, the wide-based National Stock Exchange index Nifty declined by 18.70 points, or 0.36 per cent, to 5,211 .