Hello all, thought I would join a forum and get started on this little project of mine. Got a great deal on a 2009 ER6N, and it has a few things that need work but first on my list is this error light.

What I have found so far:
Bike starts up no problem, then after a few seconds the FI light comes on. Ran the code and it comes back with code #52 which is the Ignition Coil #2 error. I have replaced the spark plugs and the ignition coils and still get the error. A buddy of mine said to just order a new harness and just throw that on there and be done with it but I wanted to get some advice. Any suggestions on next steps, things I should try. What else this could be? Something more serious? Thanks in advance, and thanks for having me here.