you should be able to do it from the dic menu, if not the tech2 can do itI did some reading where people say it randomly reset when their battery died and stuff.
Some known issue fixed by a software update if i remember correctly.
I can't get mine to do it.
Doesn't really matter, and I'm not going to mess with the odometer, but engine hours would be nice to have it reflected correctly.
just select engine hours and press and hold the check mark button (i think)