Recently got a 2011 m37 and was getting a p0305 code. Changed out the spark plugs and now I have the p0303 code. I am assuming this means the my ignition coil is probably the culprit, as I am pretty sure I used a different coil on all the plugs. (Would love if someone could confirm please!)

My question is regarding the correct ignition coil placement. My manual does not specify the correct order. Is there anywhere a diagram is available?

Thank you!

The simplest way to identify swapped coils is by the color of the trigger wire, it will be different on each coil. The colors for your '11 M37 are:
1 - Yellow
2 - Green
3 - Blue
4 - Gray
5 - Light Green
6 - Violet
Power and ground wires are White and Black respectively on all 6 coils.