Code 21? Rough Idle? Never seen that before
I put the battery back in my 07 XB12s yesterday after having it on the tender all winter to fire up for the first time this year. It started right up, but then died out. Hmmm. Well it hasn't ran in a while, probably just some bugs from sitting for months. So I start it again, this time paying closer attention. I fire it up, then I see I have a CEL. weird. The idle is also jumping between 500-1200 rpms before it dies out again. So then I follow the directions for reading the code that I found on this forum (thanks!) and it gives me code 21: active muffler control. Problem is, I have an open airbox and a drummer muffler that was installed by the previous owner. IT'S NOT EVEN THERE! I've had this bike for three years, and this has never shown up. WHYYY?????? :upset::upset::upset::upset::sorrow: