17057 - Cylinder 3 Glow Plug Circuit : Electrical Fault

r4vvm

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Engine management light popped on today Scanned the car and got this error 17057 - Cylinder 3 Glow Plug Circuit (Q12): Electrical Fault

This is second time this has happened, the first time i cleared the code and it went off.
Now 3 months later same code has come up just cleared the code but thinking i should really fix this.

I was told it may not be anything to do with the glow plugs themselves but the wiring harness, is there a way to tell it is the harness? e.g. visually damaged?

any ideas?