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Should I worry about the coolant warning light in a Passat?

Hi, I'm currently looking to move to a diesel as my new job has me doing a far longer commute. I've spotted a second hand '03 VW Passat 1.9 TDI that I like the look of. I did a full history check on the vehicle and it seems genuine. Only issue is that the coolant warning light is flashing when the coolant level is fine. A friend suggested it could be the sensor needs to be replaced, but I don't want to buy if it's something more serious. Is this a common problem with VWs?

Thanks. Sean.