Hey Dan.

If your code scanner will not clear the codes maybe try resetting the computer. Take both battery cables off and hold them together for about 30 seconds. This should clear all the codes out of the computer and reset it to factory settings. It may run crappy for a little while but after 10-15 key on-off cycles it should be running fine. Then if an O2 sensor is bad it'll throw a code again based on factory parameters.