I knew it was too good to be true. Just when I was about to write up how good the 640d Gran Coupe is proving to be it has thrown up its first fault. Over the last few days I had thought the engine felt a little uneven at start up and also the gearchange was maybe not quite as smooth as usual. I have also noticed a drop in MPG over the last few days compared to the norm. Driving home last night I got a ‘Drivetrain warning’ that flashed up for around 5 seconds and then disappeared, it was not showing on the idrive when I stopped. Pulling up at a junction there was a noticeable smell of exhaust fumes in the car and when I stopped and turned the car off at home there was a little steam coming out of the exhaust.. The car seemed okay today. Have spoken to my local dealers service manager who is currently trying to sort a loan car before booking me in. Hopefully they sort something within the next couple of days otherwise I will phone BMW assist. Any ideas as to the fault? I realise ‘drivetrain fault’ is a pretty generic message but I am wondering if it is the EGR valve @kleynie recently had an issue with? Car is still well within the AUC warranty, I will update when the car goes in and I get some feedback..