How Does Odometer Works?

CAR ODOMETER WORKING POROCESS 

The odometer is a device that informs the user on the miles traveled by a particular vehicle. An odometer is designed in two types, mechanical and electronic. The readout of the mechanical odometer uses 6 rolling disks with numbers 1 through 9. Electronic odometers give you a digital readout of the mileage. Digital odometers are usually part of a larger digital display panel in newer vehicles, odometer displays are usually under the speedometer.

When your odometer ceases to work, most people assume they must replace the unit, which can get quite expensive. However, you can repair an odometer fairly easily. The odometer stops working because the gear within the odometer has worn out. You'll need no special tools to do this, but you must know what to watch out for or you could permanently damage the speedometer that is housed in the same gauge as the odometer. Don't worry about messing with the car's recorded mileage when you repair an odometer; you will not and cannot change the mileage it has recorded. Also note: the speedometer and odometer are part of the same gauge collectively referred to as the "speedometer gauge."

When buying a car the odometer tells you on the usage the car has been through. The issue with technical odometers is that the calls can become used and the equipment can line. Since the odometer is an inner piece there is no protective repair required.