Hi. I have a 2012 X5M. Dinan tuned though. I was crusing on the highway yesterday on my way back from work. Had the M mode on. Suddenly noted a power loss and the " Engine malfunction: reduced power!!!" error came on.
Tried turning the truck off and restarting. The error persisted. I took it to the dealer last evening. They have not got back to me yet....
From what I have been reading looks like people who have had this issue needed to have their injectors replaced. Have a feeling that it will be few weeks before I get my truck back...
Will keep the thread updated based on what I hear from the dealer....