my car is up for sale again, with half the mileage

[pompous]

Originally Posted by Cloudsurfer

It's shocking at how easy it is to do on a 9X6 car (I don't know about 9X7). All you need to do is grab an appropriate cluster (basically either "old" style or "new" style) with lower miles, swap it into the car, and if it was coded correctly, you're done. If not, just get a friend with a PST to re-code it and that's it.

BMW stores the mileage in two places (the cluster and what's called the "Light Control Module") and those two values must match within 60 miles, otherwise it throws the "tamper dot" on the mileage display. Porsche only stores it in the cluster (this may have changed with the 9X7 but I don't know).

If Carfax doesn't catch it, the state should.

Really? I was thinking the box might store it in the engine control module or something. Is this not the case & it's only in the cluster? I'd think with all the security features the car has that the mileage would be kept in at least two spots to prevent such things.