mileage can only be set within the first 100 miles of a brand new set of clocks using tech2/vauxcom.
Mileage correction is a specialised field and you will need to contact a 'mileage correction' person and then have to provide proof of ownership, proof of current mileage etc etc...
You could program the older vehicles like the vectra b type of age by reading and writing the eprom using vauxcom but not the new generation of vehicles..
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