Volkswagen polo 1.2 2006 warning light on the dashboard.?

I have a volkswagen polo 2006 1.2. When I turn the key to the point just before the engine starts, a little service spanner light appears but makes no noice. The spanner appears along with the number 68000 (the actual milage on the car dissapears (which is around 120,000 miles). After about 5 second, the 6800... show more I have a volkswagen polo 2006 1.2. When I turn the key to the point just before the engine starts, a little service spanner light appears but makes no noice. The spanner appears along with the number 68000 (the actual milage on the car dissapears (which is around 120,000 miles). After about 5 second, the 6800 dissapears and is replaced with a little clock and the number 21, which I have only just noticed has been counting down each day. Does anyone know what this means?
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