Golf MK7 1.6 TDI engine light on. P0674 Glow plug circuit malfunction. Fault finding and repair.

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Among other faults, this car came to me with also the engine light on.
On a scan, it came up with only 1 active fault, cylinder number 4 glow plug circuit malfunction...
Follow me on this video to find out what was the problem and how to resolve it.

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