Sensex at the Bombay Stock Exchange fell 141 points, or 0.8 per cent, to 17,418 in opening trade, today, on profit booking, and a weak trend on the other Asian bourses. Falling further, the Sensex stood 169 points, or 1 percent in the red, at 17,390, a short while ago. Other Asian bourses in Hong Kong, South Korea, Singapore and Taiwan were dow by between 0.7 percent and 1.3 percent.