Originally Posted by gdillon

I had the same error message with check engine light staying lit, on my 05 545i. Per my invoice, the fault code was 2EF4 [T-SAT MECHANISM STUCKED] It turned out to be the thermostat was sticking in the open position so they replaced it. Yours maybe a different issue as there can multiple increased emissions light along with check engine faults.

Originally Posted by gdillon

Let me clarify that last statement. When the check engine light and message came on I drove the car for 3-4 days until I could get it in for a service. During that period only abnormal issue I noticed was the engine idled slightly rougher a few times. Now, I don't like driving with warning lights on so maybe I was being over sensitive to any slight difference in the car's behavior. I mentioned this to my SA and he said the V8 can idle rough periodically and it was not a problem.