If your speedometer is going back and forth, it could be an indication of a problem with your vehicle’s speed sensor or wiring. The speed sensor is responsible for detecting the speed of your vehicle and sending that information to the speedometer to display. If the speed sensor is malfunctioning, it may cause the speedometer to fluctuate or go back and forth.
Another possible cause could be a loose or damaged wiring connection between the speed sensor and the speedometer. A wiring issue can cause intermittent or inconsistent readings, resulting in a fluctuating speedometer.
It is important to have your vehicle inspected by a qualified mechanic to diagnose and repair any issues with your speedometer. Driving with a malfunctioning speedometer can be dangerous and may lead to an accident.