'97 Mountain Max 600 question?

Hi everyone. Pulled the Ole "loaner" sled out for the first time in 2 years. Its started, but would only Idle. Rev it and it dies.

So I cleaned the carbs out, filled with fresh fuel and . . . . . it runs GREAT!!! Better than 2 years ago even.

But the "Diagnosis" light is now flashing? What is this all about?

Runs great, plugs look just right, starts perfect . . . so?

Any thoughts would be much appreciated. Thanks!