error messages

recently my MAT censor went out and i had to replace it but after i reset the computers diagnostic code it keeps giving me the normal flash code and it wont go away?? does anyone know how i might be able t aleviate this annoyance??

Take the fuse out of the diagnostic socket :) (under-dash fuse box)

i have tried that, i have also gone to the extreme of disconnecting the negative battery terminal for a half hour to try and reset it... it just wont go away :(