Yep, that's an injector wiring harness issue. If the car isn't displaying any symptoms yet, they're in the pipeline. You may find that it intermittently starts running on two cylinders, and when it does, the whole instrument cluster will resemble a Christmas tree.
I've replaced the loom countless times for A2 owners. Normally, my electrical work doesn't involve me getting oily fingers, but this job is an exception!
Cheers,
Tom