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Gareth and other interested persons, I had a courtesy diagnostics test performed today by a local Audi dealer and it was no surprise that the result showed that there was an intermittent problem with the coolant temperature sender. So I asked how it was possible to be able to monitor the coolant temperature constantly using my fault reader connected to the OBD socket. The answer is that the sender generates 2 outputs; one going to the engine management controller (and probably also to the OBD socket) and the other to the temperature gauge. There is an issue with the temperature sender so I will replace it. Thanks again, Gareth, for your interest and help with this problem. Regards, Michael

Hi yellow is a non urgent fault red means serious, get the car scanned for faults as this will tell you the sensor that is playing up. Steve.