Brokers said profit-taking by investors is likely to continue tomorrow.
The 30-share barometer resumed slightly better and touched a high of 26,851.33 in the afternoon trade, a jump of 254.22 points from its previous close.
But soon profit-booking emerged, pulling down the key index index to 26,630.51, a small rise or 33.40 points or 0.13 per cent from its last close.
The broad-based 50-issue CNX Nifty also firmed up by 8.90 points to 7,964.80.
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Brokers said local bourses were also impacted by weak trend on Asian bourses amid concern over tensions in Hong Kong and Chinese manufacturing gauge missing estimates.
Overall, 14 of 30 Sensex scrips closed with gains. Major gainers were Sun Pharma at 2.77 per cent, HDFC 2.17 per cent, Bajaj Auto 2.00 per cent, Maruti 1.85 per cent, Cipla 1.59 per cent, RIL 1.35 per cent, ITC 1.19 per cent.
Reserve Bank Governor Raghuram Rajan in monetary policy meet today kept the key rates unchanged for the fourth consecutive timem citing continued risks to inflation and difficult external situation
The short-term lending rate rate remained at 8 per cent, and the cash reserve requirement of banks at 4 per cent. The statutory liquidity ratio has also been retained at 22 per cent.