As always Bill, it's the basic laws of the white car; if it can eff up, it will eff up, and it will be nearly impossible to figure out why because white car. The knock sensors on those are relatively sensitive to the point where any sort of external induction from even the ignition system can cause the code to pop up. The harness hitting the rear diff...well, that's bound to happen and is possibly just a fluke that it's fixed the problem. My guess would be more on the side of you have either a poor connnection or you have a knock sensor going out.
