Gday all , i have a thunder max fitted to my bike its a 2008 sportster. I have had the ck engine light come on after starting then go out so by what i can read up its a dtc thats not that bad. I  have cked the speedo for codes n got nothing i then pluged in the thunder max to computer to ck dtc it doesnt look like there is any codes there so i have cleared all dtc from thunder max and have started the bike twice and the ck engine light doesnt come on now . how could there be a code but it doesnt show up on the thunder max code reader then be gone after i clear it??? can any one help have i missed something or a page of other dtcs??? any help would be great.