my engine management light came on, diagnostic showed it to be the oxygen sensor so i had it reset and the sensor changed. since then it has come back on which i thought was due to a hole in the back box this has been changed and i turned the light off by disconnecting the battery this worked for a couple of days but is now back on. do i need to have the codes reset by diagnostic or has it come on because of another fault.

danherbe, October 2009