As the title said I am pulling a P3106 code and I have no idea what it might be. I do not have a cat but the JB4 said it is a inefficiency code. I did a little searching and found different things
http://www.e90post.com/forums/showthread.php?t=1379551
This thread said it was an O2 sensor.
http://www.1addicts.com/forums/showthread.php?t=850627
This thread said its an inefficiency code
https://bmw.spool street.com/threads...odes-list.580/
This says its a faulty injector.
Any thoughts on what it might be?