David,is urs UK-spec as well?
Just got my first 'Engine Fault' warning.Granted I was driving the car in an urban environment plus a few stationary idling without shutting down the engine.I have a feeling its a temperature related thing, but I can't be sure.Letting the car cool by switching off for a while does work in getting the warning to go off.
If it is temperature related,maybe I should consider the BMW Performance Power Kit.I think coolant temp might be the issue,cuz oil temp was a normal 115C when I had the warning.
Gonna need to solve this issue first before I start tuning.