What would cause the 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 speedometer cable is bad?
Common signs include the speedometer needle wavering or not moving, squealing noises behind the dashboard, and the Check Engine Light coming on. via
How much is it to fix speedometer?
Because the cost of repairing a broken speedometer averages around $200, you'll likely want to replace it with a new one. This can run you about $250, but you'll have an entirely new unit. The most common cause of a malfunctioning speedometer is a problem with the speed sensor. via
How does a speedometer cable work?
The speedometer cable, powered by the driveshaft, turns as well. The cable spins a magnet around at the same speed inside the speed cup. The magnet rotates continually in the same direction (in this case, counter-clockwise). The spinning magnet creates eddy currents in the speed cup. via
What would cause the speedometer to read wrong?
Reasons why your speedometer is inaccurate
Damaged wiring or a blown fuse could be enough to through the speedometer out of whack. A malfunctioning sensor or engine control unit could be reporting an erroneous speed. A change in wheel or tire size could even throw off the senor and its calculations. via
How do you fix a broken odometer and speedometer? (video)
Does the speedometer affect the odometer?
If your speedometer is off, it doesn't necessarily follow that the odometer is inaccurate too. A difference between the speed on your GPS and the speed displayed on your car's speedometer is normal, and it doesn't mean that your odometer is out of whack. via