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If memory serves me, anything more than a 3mm differential will effect the electronic nannies. I discovered this when I put a fresh set of rear tires on my car when the fronts were half worn out (figuring that with a 2 to 1 rear to front wear ratio the new rears would be worn out just about the time the old fronts were gone). After putting them on, I noticed the DTC would kick in with very little prompting on long sweeping freeway on ramps. I checked with the dealer and after some research, the service manager produced a document that called out the 3mm limit. Knowing that, I continued driving the car and pretty soon the rear wear started to catch up to the front and the DTC problem went away.
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