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I had a very unusual odometer malfunction, where after disconnecting the battery and reconnecting the odometer reset back to zero miles, zero everything. However, by disconnecting/reconnecting again it went back to normal. I would try disconnecting the battery again, after that I would check the instrument cluster connectors are seated correctly.
If I recall correctly, the odometer is stored in the instrument cluster, and nothing can roll back the mileage not even a Porsche dealer once you pass, I think its 100 miles on the odometer. If the car did actually add miles there is no way to get rid of them. There is no computer in the dash, it is under the seat. What you probably heard was the AC recalibrating itself, there are flaps to redirect the airflow in the dash that will make some noise. The car won't just add a random number to the odometer, perhaps someone has been joyriding?
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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