If your odometer stops working, there are a few things you can do to try and fix the problem. First, check the fuse that powers the odometer. If it is blown, replace it with a new fuse. If the fuse is not the problem, the next step is to check the wiring harness that connects the odometer to the car's electrical system. If any of the wires are loose or damaged, they will need to be repaired or replaced.
If the odometer still does not work after checking the fuse and wiring, the problem may be with the odometer itself. In this case, it will need to be replaced. The good news is that odometers are not very expensive, and they can be easily replaced by a qualified mechanic.