I have a 1990 Isuzu4x4 spacecab,it needs restoring some,I rebuilt the underside of the cab and the frame is rough.The check engine light goes out but the oxygen sensor light does not.I have changed the sensor,and i have changed the computer with a spare one I have.I have the factory service manuals and have checked for fault codes on the truck,everything seems okay other than this light.I have just purchased an1989 Isuzu the same as mine for parts,Ithink I will try it's computer and see what happens.Other than the light the truck works good