Thanks for the info, I didnt see a connector for the OBOII under the seat but I will look harder! I didnt the install and it is very straight forward. I did call Dynojet about some other questions but the insall isThe check engine light on these bikes can't be reset by disconnecting the battery. OP...your light being on is likely related to how your PC V was installed. Who did the installation? Was AI removed? If so was the AI solenoid taken off the bike? That is likely your culprit. If you want to know why your light came on, you have a simple solution. Ride the bike to the local autoparts store and have the codes read and the light reset...connector is under the seat. If you don't root cause why the light came on it will return of course. You need to provide more details of your PC V install which is likely why your light came on.