I heard a 2007 with version 18 can't actually delete the rear o2 sensors. True?!?! I've deleted mine twice and the fuckers are still giving codes.
Version 18 on an extremely high percentage of the cars I saw would actually trip a different code when you turned the rear O2's off. You would get a "high voltage" code instead for the rear O2's, signifying that the sensors had been unplugged, on the second key cycle. This mainly affected the 07's. The newer versions have this fixed. Joshua, HHP