I got to try the configuration I sent you on a bike here alte last night, bike was a 2003 999 and indeed it renders 37.3 error.To be safe I will use the ecu you sent me and reprogram that one with a configuration that I tested last night that works on the bike I tried last night (2003 999).So please send the ecu back to me and I'll ship the new ecu today, I will refund you the shipping here.Sorry for the inconvenience! However it will work out, dont worry.