What causes a speedometer to stop working?
The most common causes of a speedometer that stopped working include are a faulty speed sensor, a broken gear on the speedometer, damaged wiring, or a faulty engine control unit. via
How do I know if my speed sensor is bad?
Is it safe to drive if speedometer not working?
Can You Still Drive Your Car If the Speedometer Doesn't Work? Technically speaking, it is possible to drive a vehicle with an inoperable speedometer. However, doing so is not recommended. Without an alternative solution at the ready, you will be unable to recognize the speed at which your vehicle is traveling. via
Can a speedometer be fixed?
The speedometer doesn't settle on a specific reading but keeps jumping between speeds. The cause is almost always bad wiring if there is a cable system, or alternatively, a bad speed sensor. For the most part, a replacement of the wiring solves the issue. If that doesn't work, the sensors must be re-calibrated. via