I had that code present in my ecu, with my previous tuners, tune, never was resolved. I also had a boost solenoid pulsing noise(sure it's a relay?, solenoid is close by) with key on at the same time, again was never resolved. Changed tuners, no more codes other than cat efficiency which is explained with the 100cpi cat. With this same previous tune, I did have a misfire like event at 5000rpm plus, but I put that down to valve springs, because when I did them, it went away. Hope to have been some help.