The speedometer is an instrument that measures and displays the instantaneous speed of a car. It is powered by an electrical signal from the speed sensor, which is mounted on the transmission. The speed sensor sends a signal to the speedometer, which converts it into a speed reading.
If the odometer on a 2004 Impala LS still works, it is unlikely that the problem with the speedometer is due to a speed sensor problem. The most likely cause of the problem is a faulty speedometer head, which is the part of the speedometer that displays the speed reading.
Here are some other possible causes of a faulty speedometer:
* Faulty wiring between the speed sensor and the speedometer
* Faulty ground connection for the speedometer
* Faulty instrument cluster, which is the part of the dashboard that contains the speedometer
If you are experiencing a problem with your speedometer, it is best to have it diagnosed by a qualified mechanic.
