Hi I have a 2007 407 2.0 hdi, the media centre stopped working, and the mileage has changed to kph and won't change back to mph, any idea off the problem pls

Go to the trip computer settings.

if your cluster is mechanical, then it is not possible to change the settings. you can attempt to get a genuine cluster from Mercedes Benz by using your VIN and request for a cluster that displays KPH.
However, if your cluster is Digital, or uses an LCD display, then you will need a STAR DIagnosis tool, hook it up to the car, and perform something known as SCN Coding to the cluster. There you will have the option to change it from MPH to KPH

yes

You likely need the correct computer to match the cluster, and no you will not have the original mileage anymore.

most have a dial or button on the cluster , for mph and kph , if its a digital dash the owners manual should have it in appendix under speedometer , last resort call the dealer with youre vin number located on left hand corner of dashboard behind windshield

it sounds like you have switched you spedometer over to KPH and not MPH change the instements back to english. and that should take care of your problem.....good luck

From the sounds of it the vehicle computer was switched from mph to kph. You should be able to change this back using the driver information center located above your stereo under your settings options. 40mph=64.4 kph. If you have your owners manual available may want to consult that how to completely change it back.

Hi!!
Check on the instrument cluster for a switch labeled English/Metric, pressing that switch will change the display back to miles.
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Go on line and find a used Spider speedo USA or UK and change the whole assembly. It's easier to change than taking apart the speedo. Also there are some new ones on the net too.

Go into setup menu in the DIC til you see unit measure! Then select unit measure and everything will be back to normal. One is for kph and celcius, Liter/100km, fuel liter used etc and the other one is for mph, farhenheits, mpg, fuel gallon used etc.