Today they changed the ABS unit in my 2010 Renault Fluence (regular engine). They put in a second hand unit. After getting my Fluence back I noticed that my dashboard showed 283.640km instead of the 134.577 when I gave them the car. Is this normal? If I would have entered a brand new ABS unit it would have shown 0km? What can be done to get my original km on the dashboard? I somehow have the feeling they did something with the electronics because the clock was on zero and blinking and all this though the ABS unit has nothing to do with the electronics and there is no reason to to take off the battery.