I am helping a friend of my wife's with her 2007/08 X5 3.0si that has a Check Engine light with code P0301 by AutoZone staff. I believe the engine is a 6-cylinder and the code is for cylinder #1 misfire.

I guess a fix starts with checking cylinder #1's spark plug, fuel injection and ignition coil. Please advise on how to identify cylinder #1.

Thank you.