One thing that springs to mind is that on the 5 cylinder engines, there was an issue at some point that the wiring would break for the injector, I think it was either 1 or 5. That could be the cause of your current issue, especially if they've been poking around in the engine bay.
What I can't believe is that they left it like that when it wasn't that bad when it came in. I too haven't felt the love from the dealer network but I wouldn't expect something like that.
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2017 V60 D4 Geartronic
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