On the '04 V70, there are 2 trip odometers. I use these pretty extensively, especially when on a long trip. Mine (both) keep resetting themselves without any adjustment from me or the wife. It seems to happen at fairly high mileage, and last time I notice it did it was when I cut the engine to fill up with gas. Don't know if filling up and the "auto reset" is related. Just that it's very annoying and makes one take out a paper and pencil to continue the log begun for the trip. I tried a search here and read that for S60 and S80 there was a "software fix" for the odometer resetting at 600+ miles, but don't know if this is my problem or not. Any help would be appreciated. Otherwise, the car has absolutely no issues and was a pleasure to drive, getting about 30mpg on the way to and from the beach, a 900+ mile round trip!