Yup, put on new bars. Got the 1510 code. I've read the other threads regarding this code, but they all included one if not two more codes with it. It threw the 2138 at me also but that one cleared. The 1510 won't clear. Bike runs ok. Seems a bit sluggish but while riding, pull in the clutch, rev the throttle and it's muffled. That's when I noticed the engine light was on. Hasn't gone off since. So, the other threads that talk about the throttle by wire also had the 2138 code which references the throttle, but the 1510 is "EFI Limited Performance Mode". Is that still throttle related? I did other wiring with the "rebuild" as well when I put yaffe taillights on my new rear fender, and a new sound system. I'm just trying to avoid poking around in connections that are not related to the issue. I did the work myself, except pull the wires through the bars. Didn't need to extend the wires but the TBW was replaced with a Screaming Eagle. Any ideas on where to start?