It happened to me recently....took it to dealer and was confirmed to be gasoline quality related. The high ethanol mix on certain station is messing up the M5 timing. I switch gas station and problem went away. So I only get gas from certain selected station (not just brand) , of course you want to go with Tier-1 Gas like Shell or Chevron.Hello fellow M5 enthusiasts,
I purchased my 2007 M5 in July of 09 and the car is awesome. However, recently twice this engine malfunction warning has come up. the first time was when I returned from vacation after the car was sitting for two weeks garaged.
Look forward to hearing from you.