i have a 02’ roadking and my check engine light comes on only when I’m on the highway. I checked how to find error codes in the speedometer and it show that do1&5 say er the other 8 day clr. Witch I understand means clear. 1&5 are a concern. Does anyone know what maybe the problem? The bike is running fine but I would like to know what the errors might be

Check here for the error codes and their designated meanings:

https://www.fuelmotousa.com/p-29661-...ble-codes.html