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A bunch of mods were done to my 09 RKC
Apes, inter primary, full exhaust, SE stage 1
Etc.. It's back together and runs great
But the check engine light is on did it just pull
A code because everything was apart
So check the code(s) and that will tell you where the issue is if any. May just be a historical code and can be cleared and the engine light will shut off
Same thing happened to me when I installed new levers. Check engine light came on. Dealer said I broke the tweaked (didn't break) the brake switch, and that caused the light.