So I just got back from picking the car up.

I turns out it was just a failed "spark plug cable" on cylinder one.  Apparently nowdays its not a cable but something electronic and therefore costs 100usd.  The final bill was 300usd including the diagnostics, parts, labour and taxes.

I dont know what US costs are like, but here in Switzerland a service costs 800-1000usd, so 300usd is cheap. Mightily relieved as I was expecting another 0 on the end...

Daniel