Had the engine manegment light come on this morning took it stright in to my brothers garage and he plugged it in to vag com. It said intermitant fault on coolant temp sensor, cleared it and now light is off. I have been told that it can sometimes do this when starting on a cold morning but once cleared it can be ok is it worth replacing senor yet or should i wait. Anyone replaced one before, how much i am looking at for the part and are they easy to fit.