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Thread: Air Filter and Code 21 Help

  1. #1
    Junior Member
    Join Date
    Apr 2020
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    6

    Air Filter and Code 21 Help

    Hi I have a 2009 buell lightening xb12scg I just got a few weeks back. It came with a jardine exhaust and I purchased buelltooth to diagnose the check engine light. The codes that come back are code 21 amc stuck open and sometimes it will run code 21 amc short to ground. I tinkered with it a bit and turned off the exhaust valve enable check box on ecm droid. When I do that the bike seems to idle normal and run properly. Last night I then found out my bike doesnt even have an air filter on it and lord knows how long the previous owner rode it without one.Could putting an air filter on be the final and last fix I need for it to run 100% and possible help to clear the codes that stick around even after tinkering with the exhaust config on ecm droid, because simply checking exhaust valve enable doesnt exactly clear the codes from ecm droid, but it does flick off the cel. When I manually erase the codes on ecm droid, the bike starts to sputter and idle like it wants to shut off, but when I leave the codes in the "stored errors" section and not randomly erase them, the bike runs fine and doesnt putter.

  2. #2
    Airfilter is a MUST!
    I wouldnt even start without one.

  3. #3
    Junior Member
    Join Date
    Apr 2020
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    6
    That's what a couple friends said. I'm going to order one and get it put in and see if that is the cause of it running the way it is.

  4. #4
    Senior Member Cooter's Avatar
    Join Date
    Dec 2012
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    Crawling up your skirt
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    7,963
    The intake system of a Buell is really really sensitive. An air filter is a MUST and make SURE the lip of the airhorn gasket is installed in the airbox base correctly or they WILL run poorly.



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