* Speed sensor failure. The speed sensor is a device that measures the rotation of the wheels and sends this information to the speedometer and odometer. If the speed sensor fails, the speedometer and odometer will not work.
* Problem with the wiring. If there is a problem with the wiring between the speed sensor and the speedometer and odometer, this will cause the speedometer and odometer not to work.
* Faulty speedometer and odometer. In some cases, the speedometer and odometer themselves may be faulty, causing them not to work.
* Instrument cluster failure: The instrument cluster, which houses the speedometer and odometer, may have failed, causing them to stop working.
Diagnosis
To diagnose the problem, you will need to perform some tests on the speed sensor, wiring, speedometer, and odometer. You can do this yourself with a multimeter or by taking the car to a mechanic.
Repairs
Once you have diagnosed the problem, you will need to repair it. If the speed sensor is faulty, it will need to be replaced. If the wiring is damaged, it will need to be repaired or replaced. If the speedometer or odometer are faulty, they will need to be replaced.
If the instrument cluster is faulty, it may be possible to repair it, but in some cases, it may need to be replaced.
