The Bombay Stock Exchange 30-share gauge resumed better and touched a high of 18,565.56 on firm Asian cues.
However, heavy selling after mid-session pulled it down to settle near the day's low level of 18,226.48, registering a fall of 211.30 points or 1.15 per cent. Previously, it had settled at 18,021.16 on September 13, 2012. In five days of trading, Sensex has plunged by 814.47 points or 4.28 per cent.
Ahead of its earnings on Friday, Infosys lost 2.36 per cent and continued to be on the selling list.
Besides IT stocks, refinery, PSU, FMCG and realty shares attracted profit-booking even at current lower levels.
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Similarly, CNX Nifty index fell by 47.85 points to end at 5,495.10, also its lowest closing since September 13, 2012.
Sustained selling by FIIs, the main market mover, is one of the main reasons behind the recent downslide. FIIs sold shares worth Rs 163.95 crore yesterday.
Selling was seen all across with 12 out of 13 sectoral indices closed with losses up to 2.10 per cent. Bucking the overall trend, BSE-Auto rose by 0.41 per cent following 2.2 per cent gain in Tata Motors -- the top gainer from Sensex. TCS also gained 1.1 per cent after announcing Alti SA buy.