sorry dont know much about the mass air flow. my check engine light turned off for some reason i dont know. but i found out what 26 means. it was something about running too rich. im just going to give my car a tune up first. i also read that it can be the ign. coils. problem for running too rich. i only get around 230miles per full tank and i think i should be getting over 300 per tank. hopefully the tune up will take care of it and the check engine light