Unable to confirm Services

I have an issue with my cars an w211 E280 CDI which is their is no way to confirm any of the service .
It is now showing "Service F" after taking it to a Guy for diagnostic his tool was saying that their is a mileage difference between the instrument cluster and the Central gateway.
on the Central Gateway i have 65000Km while on the Instrument Cluster i have 150000km
. From what i have seen on internet their is a synchronization between all the devices that store the mileages stuff. should i look for something disconnected ? .

Would be very grateful if you could help me find a solution .



