No power to glow plug 4

Richy1970

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Hi all
The engine management light came on wife’s A3 2.0 tdi convertible yesterday and the code was glow plug 4 fault so replaced all 4 glow plugs but light came back on. She has being having trouble starting since it’s dropped cold. I’ve tested power to the glow plugs and there’s no power to glow plug 4. Any ideas please could it be glow plug relay fault ??