OPOL CORSA CUELTAKILOMETERS.

Hello, I have a problem with my Opel Corsa, the account of the accounting man is where he wants when I stop the car, take away from that moment when I continue the march where I stop takes it as zero, that is, if it stopped in 100km/Hy I go to 40km/h the accounting brand 140km/h. Can anyone tell me what happens to me, and how much can the arrangement cost me? Thank you

Hello Miguel, if your Corsa is old, (from 90) the velocimetter is mechanical and they may have disassembled it to touch it, or between dirt on the recovery spring, disassemble and blow it by behind where it carries the axis, lubricate it with spray where you click the velocimeter cable. If it is one of the new ones, then it will be electronic to look at sensor and also dirt on the axis.