Just to add
Its also very common for the coolant temp sender that does guage an ecu to die, i take your golf is a pd tdi.
its mounted under the vacuum pump on end of cylinder head.
its been revised about 4 times an is now green 059-919-501A
Your need o ring N90316802 and clip #032121142 too.
Get these from a dealer as the copy ones are poo
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